CREE CXA2540

CLD-AP122 rev 1A
application
note
technical article
®
®
Cree XLamp CXA2530/CXA2540 LED
Retail Track Light Reference Design
Table of contents
Introduction
Introduction...........................................................1
This application note details the design of a 39‑watt
Design approach/objectives......................... . . . . . . 2
equivalent
The 6-step methodology............................ . . . . . . 2
CXA2530 LED. The CXA2530 is optimized to simplify
1. Define lighting requirements................. . . . . . . . 2
designs and lower system cost and can enable system-
2. Define design goals........................... . . . . . . . 5
level performance of 2000 to 5000 lumens. The XLamp
3. Estimate efficiencies of the optical, thermal &
CXA2530 LED delivers high lumen output and high
electrical systems............................. . . . . . . . 6
4. Calculate the number of LEDs needed.. ...... . . . . . . 8
retail
track
light
using
Cree’s
XLamp
efficacy in a single, easy-to-use package that eliminates
the need for reflow soldering.
5. Consider all design possibilities............... . . . . . . 9
6. Complete the final steps....................... . . . . . . 9
The XLamp CXA2530 LED highlighted in this reference
Conclusions.. . . . . . . ................................... . . . . . 12
design
Special thanks.. . . . ................................... . . . . . 13
traditionally use halogen, ceramic metal halide (CMH)
Bill of materials. . . . ................................... . . . . . 13
and compact fluorescent lamp (CFL) technology. In this
Appendix.. . . . . . . . . . .................................. . . . . . . 14
reference design, the XLamp CXA2530 LED is used in
is
optimized
to
enable
applications
that
a retail track light that operates on direct line 120‑VAC
input. The goal of the design is to enable a retail track
light with a narrow beam, based on a single XLamp
CXA2530 LED, delivering performance equivalent to a
www.cree.com/Xlamp
39‑watt CMH lamp.
Reliance on any of the information provided in this Application Note is at the user’s sole risk. Cree and its affiliates make no warranties or representations
about, nor assume any liability with respect to, the information in this document or any LED-based lamp or luminaire made in accordance with this
reference design, including without limitation that the lamps or luminaires will not infringe the intellectual property rights of Cree or a third party.
Luminaire manufacturers who base product designs in whole or part on any Cree Application Note or Reference Design are solely responsible for the
compliance of their products with all applicable laws and industry requirements.
Copyright © 2010 Cree, Inc. All rights reserved. The information in this document is subject to change without notice.
Cree, the Cree logo and XLamp are registered trademarks of Cree, Inc.
Copyright © 2013 Cree, Inc. All rights reserved. The information in this document is subject to change without notice. Cree®, the Cree
logo and XLamp® are registered trademarks and EasyWhite™ is a trademark of Cree, Inc. For product specifications, please see the
data sheets available at www.cree.com. For warranty information, please contact Cree Sales at [email protected]
Cree, Inc.
4600 Silicon Drive
Durham, NC 27703
USA Tel: +1.919.407.5300
XLAMP CXA2530/CXA2540 RETAIL TRACK LIGHT REFERENCE DESIGN
The appendix to this reference design shows the results obtained when an XLamp CXA2540 LED was used in place of
the CXA2530 LED.
Design approach/objectives
In the “LED Luminaire Design Guide” application note, Cree advocates a 6‑step framework for creating LED luminaires.1
All Cree reference designs use this framework, and the design guide’s summary table is reproduced below.
Step
Explanation
1.
Define lighting requirements
• The design goals can be based either on an existing fixture or on the application’s lighting requirements.
2.
Define design goals
• Specify design goals, which will be based on the application’s lighting requirements.
• Specify any other goals that will influence the design, such as special optical or environmental requirements.
3.
Estimate efficiencies of the
optical, thermal & electrical
systems
• Design goals will place constraints on the optical, thermal and electrical systems.
• Good estimations of efficiencies of each system can be made based on these constraints.
• The combination of lighting goals and system efficiencies will drive the number of LEDs needed in the
luminaire.
4.
Calculate the number of LEDs
needed
• Based on the design goals and estimated losses, the designer can calculate the number of LEDs to meet the
design goals.
5.
Consider all design
possibilities and choose the
best
• With any design, there are many ways to achieve the goals.
• LED lighting is a new field; assumptions that work for conventional lighting sources may not apply.
6.
Complete final steps
•
•
•
•
•
Complete circuit board layout.
Test design choices by building a prototype luminaire.
Make sure the design achieves all the design goals.
Use the prototype to further refine the luminaire design.
Record observations and ideas for improvement.
Table 1: Cree 6-step framework
The 6-step methodology
The goal for this project is to demonstrate an easy-to-implement, high-output lamp that can better the performance of
39‑W CMH lamps currently on the market, showing that a narrow-beam 39‑watt equivalent retail track light is possible
using a single XLamp CXA2530 LED.2
1. Define lighting requirements
Table 2 shows a ranked list of desirable characteristics to address in a track light.
1
2
LED Luminaire Design Guide, Application Note AP15, www.cree.com/xlamp_app_notes/luminaire_design_guide
Production and cost-optimized implementations are beyond the scope of this document.
Copyright © 2013 Cree, Inc. All rights reserved. The information in this document is subject to change without notice. Cree®, the Cree logo and XLamp® are registered trademarks
and EasyWhite™ is a trademark of Cree, Inc. For product specifications, please see the data sheets available at www.cree.com. For warranty information, please contact Cree Sales
at [email protected]
2
XLAMP CXA2530/CXA2540 RETAIL TRACK LIGHT REFERENCE DESIGN
Importance
Critical
Important
Characteristics
Units
Luminous flux
lumens (lm)
Light intensity - center beam candle power (CBCP)
candelas (cd)
Beam angle - full width half maximum (FWHM)
degrees (°)
Luminaire efficacy
lm/W
Electrical power
watts (W)
Lifetime
hours
Operating temperatures
°C
Correlated color temperature (CCT)
K
Color rendering index (CRI)
100-point scale
Power factor
Table 2: Ranked design criteria for a track light
Table 3 and Table 4 summarize the ENERGY STAR® requirements for directional commercial and residential luminaires.3
ENERGY STAR REQUIREMENTS
Luminaire Type
Luminaire Efficacy (Initial)
Luminaire Minimum Light
Output (Initial)
Luminaire Zonal Lumen
Density Requirement
Accent Lights
• includes line voltage track heads
• includes directional ceiling fan
light kits
35 lm/W
Luminaire shall deliver a minimum
of 200 lumens per head.
Luminaire shall deliver a minimum
of 80% of total initial lumens within
the 0-40° zone (axially symmetric
about the center of the beam).
Table 3: ENERGY STAR luminous efficacy, output and zonal lumen density requirements
Characteristic
Requirements
Light source life requirements: all
luminaires
The LED package(s) / LED module(s) / LED array(s), including those incorporated into LED light engines or
GU24 based integrated LED lamps, shall meet the following L70 lumen maintenance life values (refer to Lumen
Maintenance Requirements in the next section):
• 25,000 hours for residential grade indoor luminaires
• 35,000 hours for residential grade outdoor luminaires
• 35,000 hours for commercial grade luminaires
Lumen maintenance life projection claims in excess of the above requirements shall be substantiated with a
TM‑21 lumen maintenance life projection report.
3
ENERGY STAR Program Requirements, Product Specification for Luminaires (Light Fixtures), Eligibility Criteria, Version 1.2,
www.energystar.gov/ia/partners/product_specs/program_reqs/Final_Luminaires_V1_2.pdf?7b7d-2473
Copyright © 2013 Cree, Inc. All rights reserved. The information in this document is subject to change without notice. Cree®, the Cree logo and XLamp® are registered trademarks
and EasyWhite™ is a trademark of Cree, Inc. For product specifications, please see the data sheets available at www.cree.com. For warranty information, please contact Cree Sales
at [email protected]
3
XLAMP CXA2530/CXA2540 RETAIL TRACK LIGHT REFERENCE DESIGN
Characteristic
Requirements
Lumen maintenance
requirements: directional and
non-directional luminaires
The LED package(s) / module(s) / array(s), including those incorporated into LED light engines or GU24 based
integrated LED lamps, shall meet the following L70(6k) rated lumen maintenance life values, in situ:
• L70(6k) ≥ 25,000 hours for residential indoor
• L70(6k) ≥ 35,000 hours for residential outdoor, or commercial
Compliance with the above shall be documented with a TM-21 lumen maintenance life projection report as
detailed in TM-21, section 7. The report shall be generated using data from the LM-80 test report for the
employed LED package/module/array model (“device”), the forward drive current applied to each device, and the
in situ TMPLED temperature of the hottest LED in the luminaire. In addition to LM-80 reporting requirements, the
following information shall be reported:
• sampling method and sample size (per LM-80 section 4.3)
• test results for each TS and drive current combination
• description of device including model number and whether device is an LED package, module or array (see
Definitions)
• ANSI target, and calculated CCT value(s) for each device in sample set
• Δ u’v’ chromaticity shift value on the CIE 1976 diagram for each device in sample set
• a detailed rationale, with supporting data, for application of results to other devices (e.g. LED packages with
other CCTs)
Access to the TMPLED for the hottest LED may be accomplished via a minimally sized hole in the luminaire
housing, tightly resealed with a suitable sealant if created for purposes of testing.
All thermocouple attachments and intrusions to luminaire housing shall be photographed.
CCT requirements: all indoor
luminaires
The luminaire (directional luminaires), or replaceable LED light engine or GU24 based integrated LED lamp (nondirectional luminaires) shall have one of the following nominal CCTs:
•
•
•
•
•
2700
3000
3500
4000
5000
Kelvin
Kelvin
Kelvin
Kelvin
Kelvin (commercial only)
The luminaire, LED light engine or GU24 based integrated LED lamp shall also fall within the corresponding
7-step chromaticity quadrangles as defined in ANSI/NEMA/ANSLG C78.377-2008.
Color rendering requirements: all
indoor luminaires
The luminaire (directional luminaires), or replaceable LED light engine or GU24 based integrated LED lamp (nondirectional luminaires) shall meet or exceed Ra ≥ 80.
Color angular uniformity
requirements: directional solid
state indoor luminaires
Throughout the zonal lumen density angles detailed above, and five degrees beyond, the variation of
chromaticity shall be within 0.004 from the weighted average point on the CIE 1976 (u’,v’) diagram.
Color maintenance requirements:
solid state indoor luminaires only
The change of chromaticity over the first 6,000 hours of luminaire operation shall be within 0.007 on the CIE
1976 (u’,v’) diagram, as demonstrated by either:
• the IES LM-80 test report for the employed LED package/array/module model, or
• as demonstrated by a comparison of luminaire chromaticity data in LM-79 reports at zero and 6,000 hours, or
• as demonstrated by a comparison of LED light engine or GU24 based integrated LED lamp chromaticity data in
LM-82 reports at zero and 6,000 hours.
Source start time requirement:
directional and non-directional
luminaires
Light source shall remain continuously illuminated within one second of application of electrical power.
Dimming requirements
The luminaire and its components shall provide continuous dimming from 100% to 35% of total light output.
Step dimming, if employed, shall provide at least two discrete light output levels ≥ 35% of total light output and
not including 100% output.
Power factor requirements:
directional and non-directional
luminaires
Total luminaire input power less than or equal to 5 watts: PF ≥ 0.5
Total luminaire input power greater than 5 watts:
Residential: PF ≥ 0.7
Commercial: PF ≥ 0.9
Copyright © 2013 Cree, Inc. All rights reserved. The information in this document is subject to change without notice. Cree®, the Cree logo and XLamp® are registered trademarks
and EasyWhite™ is a trademark of Cree, Inc. For product specifications, please see the data sheets available at www.cree.com. For warranty information, please contact Cree Sales
at [email protected]
4
XLAMP CXA2530/CXA2540 RETAIL TRACK LIGHT REFERENCE DESIGN
Characteristic
Requirements
Transient protection
requirements: all luminaires
Ballast or driver shall comply with ANSI/IEEE C62.41.1-2002 and ANSI/IEEE C62.41.2-2002, Class A operation.
The line transient shall consist of seven strikes of a 100 kHz ring wave, 2.5 kV level, for both common mode and
differential mode.
Operating frequency
requirements: directional and
non-directional luminaires
Frequency ≥ 120 Hz
Noise requirements: directional
and non-directional luminaires
All ballasts & drivers used within the luminaire shall have a Class A sound rating.
Note: This performance characteristic addresses problems with visible flicker due to low frequency operation and
applies to steady-state as well as dimmed operation. Dimming operation shall meet the requirement at all light
output levels.
Ballasts and drivers are recommended to be installed in the luminaire in such a way that in operation, the
luminaire will not emit sound exceeding a measured level of 24 BA.
Table 4: ENERGY STAR luminaire requirements
The DesignLights™ Consortium (DLC) provides requirements for track or mono-point directional lighting fixtures,
summarized in Table 5.4
Characteristic
Minimum light output
Unit
DLC Value
lm
250
Zonal lumen density
≥ 85%: 0-90°
Minimum luminaire efficacy
Allowable CCTs (ANSI C78.377-2008)
lm/W
40
K
≤ 5000
CRI
80
L70 lumen maintenance
hours
50,000
Minimum luminaire warranty
years
5
Table 5: DLC track light requirements
2. Define design goals
In addition to the requirements given in the above tables, we examined existing 39-W CMH lamp data sheets to develop
the goals shown in Table 6. We found that the input power for luminaires using 39-W CMH lamps is 44 to 45 W, so we
targeted this reference design to be at least equivalent.
Table 6 shows the design goals for this project.
Characteristic
Light output
Light intensity - CBCP
Unit
Minimum Goal
Target Goal
lm
3200
> 3200
> 20,000
cd
20,000
degrees
15
15
Luminaire efficacy
lm/W
75
> 75
Lifetime
Beam angle - FWHM
hours
35,000
50,000
CCT
K
3000
3000
CRI
100-point scale
80
80
W
44
< 44
0.9
> 0.9
Power
Power factor
Table 6: CXA2530 retail track light design goals
4
Technical Requirements Table v1.7, DesignLights Consortium
www.designlights.org/solidstate.manufacturer.requirements.php
Qualified
Products
List
-
Non-Residential
Applications,
Copyright © 2013 Cree, Inc. All rights reserved. The information in this document is subject to change without notice. Cree®, the Cree logo and XLamp® are registered trademarks
and EasyWhite™ is a trademark of Cree, Inc. For product specifications, please see the data sheets available at www.cree.com. For warranty information, please contact Cree Sales
at [email protected]
5
XLAMP CXA2530/CXA2540 RETAIL TRACK LIGHT REFERENCE DESIGN
3. Estimate efficiencies of the optical, thermal & electrical systems
We used Cree’s Product Characterization Tool (PCT) tool to determine the drive current for the design.5 Figure 1 shows
Comparison
basic electrical data and optical output from the PCT. We estimated 90% optical efficiency,LED
85%System
driver efficiency
and a
solder point temperature (TSP) of 70 °C.
System:
Rep
1
3,000
Target Lumens :
90
Optical Efficiency:
Current (A)
LED 1
Model
Flux
LED 2
Model
Cree XLamp CXA2530 {EZW}
Tsp (ºC)
T2 [3200]
$
Price
SYS # LED SYS lm tot
0.900
1
3073.91
0.950
1
3184.98
1.000
1
3290.86
1.100
1
3483.93
1.200
1
3653.5
0.000
#N/A
#N/A
Figure 1: PCT output with
Flux
70
Price
SYS W
37.617
39.959
42.326
47.126
52.025
#N/A
(none)
Tj (ºC)
$
2
-
SYS lm/W
81.7
79.7
77.8
73.9
70.2
#N/A
CXA2530 flux data
#N/A
#N/A
#N/A
#N/A
#N/A
#N/A
#N/A
#N/A
#N/A
#N/A
#N/A
#N/A
#N/A
#N/A
#N/A
#N/A
#N/A
#N/A
#N/A
#N/A
#N/A
#N/A
#N/A
#N/A
This document is provided for informational purposes only and is not a warranty or a specification. For product specifications, please see the data
Copyright © 2009-2012 Cree, Inc. All rights reserved. The information in this document is subject to change without notice. Cree, the Cree logo a
The PCT output shows that, at 1 A, a single XLamp CXA2530 LED produces the desired lumen output and efficacy.
Thermal Requirements
Proper thermal management is a key component of any successful LED-based lamp or luminaire design. Operating at
42 W of power in this retail track light design, the XLamp CXA2530 LED requires a heat sink to dissipate this thermal
load. The heat sink in this design must not only dissipate the heat generated by the LED, but also provide the mechanical
frame for the LED, optic, driver and base. We used a market-ready heat sink/housing assembly, shown in Figure 2.6 The
heat sink is made of anodized aluminum alloy, AA 6063, and is part of a kit that includes a cover glass, screw-on base
and front optic cover ring.
Figure 2: CXA2530 retail track light heat sink/housing assembly
5 PCT is available at: pct.cree.com
6Model GD120-01, Losiwang, www.loswan.cn
Copyright © 2013 Cree, Inc. All rights reserved. The information in this document is subject to change without notice. Cree®, the Cree logo and XLamp® are registered trademarks
and EasyWhite™ is a trademark of Cree, Inc. For product specifications, please see the data sheets available at www.cree.com. For warranty information, please contact Cree Sales
at [email protected]
6
XLAMP CXA2530/CXA2540 RETAIL TRACK LIGHT REFERENCE DESIGN
We performed thermal simulation to verify that this thermal design is sufficient.7 Figure 3 shows thermal images of
the lamp assembly. The simulated peak solder point temperature (TSP) is 64 °C, or 39 °C above ambient. The thermal
Thermal Simulation / Measurement
resistance of the XLamp CXA2530 LED is 0.8 °C/W, so at 42 W the junction temperature (TJ) will be approximately 98 °C.
Tsp
63.5
T2
Thermal Simulation Tsp ~64C,
Figure 3: CXA2530 retail track light thermal simulation
Copyright © 2010, Cree, Inc.
T3
•About 75
to heat an
the heat
•Thermal
~63.5C
•Calculat
Cree Proprietary & Confidential
Drive Electronics
Tsp
T2
T3
Cree selected a dimmable, universal input voltage driver to supply power to the retail track light.8 The driver is a slightly
63.5℃
60.4℃
℃
modified version of a commercially available driver model. The driver, shown in Figure 4, is located off the track and is
attached to the heat sink/housing assembly.
Thermal Simulation Tsp ~64C,
Copyright © 2010, Cree, Inc.
Cree Proprietary & Confidential
•About 75% of the 42W input power will convert
to heat and need sufficient heatsink to dissipate
the heat
•Thermal measurement by thermal couple: Tsp
~63.5C
•Calculated Tj ~94C
pg. 8
Figure 4: CXA2530 retail track light driver
Secondary Optics
It is a challenge to create a narrow‑beam optic for a relatively large light source such as the XLamp CXA2530 LED. This
design meets the challenge with a custom reflector that is about 89% optically efficient and produces a 16° beam angle.9
The reflector, shown in Figure 5, fits within the heat sink/housing assembly.
7
For additional information on thermal management, refer to the Thermal Management of Cree XLamp LEDs Application Note, AP05,
www.cree.com/xlamp_app_notes/thermal_management
8Model ERP040W-1000-39, Energy Recovery Products (ERP), www.erppowerllc.com/
9Model 4-1361-1, Nata Lighting Company Limited, www.nata.cn/
Copyright © 2013 Cree, Inc. All rights reserved. The information in this document is subject to change without notice. Cree®, the Cree logo and XLamp® are registered trademarks
and EasyWhite™ is a trademark of Cree, Inc. For product specifications, please see the data sheets available at www.cree.com. For warranty information, please contact Cree Sales
at [email protected]
7
XLAMP CXA2530/CXA2540 RETAIL TRACK LIGHT REFERENCE DESIGN
Figure 5: CXA2530 retail track light reflector
4. Calculate the number of LEDs needed
The dual purpose of this reference design is to show that a single LED package can deliver equivalent lighting utility and
superior performance compared to existing 39-W CMH lamps on the market and show that it is possible to produce a
narrow-beam retail track light based on the XLamp CXA2530 LED. The CXA2530 LED is a multi-chip LED package that
can offer the required CBCP with new levels of LED-to-LED color consistency and efficiency. The new XLamp CXA2530
LED is 34% brighter than the original CXA2011,10 which can enable superior LED lighting designs even more quickly.
We selected a Warm White LED for this reference design, shown highlighted in yellow in Table 7. By choosing an LED
from a mid-level flux bin, we ensured that the design uses an LED that is readily available.
Color
CCT
Range
4000K
3500K
EasyWhite
3000K
2700K
Base Order Codes
Min. Luminous Flux
@ 800 mA
2-Step Order Code
4-Step Order Code
Group
Flux
(lm) @
85 °C
Flux
(lm) @
25 °C*
T2
3200
3609
T4
3440
3879
U2
3680
4150
CXA2530-0000-000N00U240H
CXA2530-0000-000N00U240F
S4
2990
3372
CXA2530-0000-000N00S435H
CXA2530-0000-000N00S435F
T2
3200
3609
T4
3440
3879
S4
2990
3372
T2
3200
3609
S2
2780
3135
S4
2990
3372
T2
3200
3609
Chromaticity
Region
Chromaticity
Region
CXA2530-0000-000N00T240H
40H
35H
CXA2530-0000-000N00T440H
CXA2530-0000-000N00T235H
CXA2530-0000-000N00T240F
40F
35F
CXA2530-0000-000N00T435H
30H
CXA2530-0000-000N00S430H
CXA2530-0000-000N00T230H
CXA2530-0000-000N00S427H
CXA2530-0000-000N00T227H
CXA2530-0000-000N00T235F
CXA2530-0000-000N00T435F
30F
CXA2530-0000-000N00S227H
27H
CXA2530-0000-000N00T440F
CXA2530-0000-000N00S430F
CXA2530-0000-000N00T230F
CXA2530-0000-000N00S227F
27F
CXA2530-0000-000N00S427F
CXA2530-0000-000N00T227F
Table 7: CXA2530 LED order codes
10Measured at 1 A, junction temperature (TJ) = 85 °C
Copyright © 2013 Cree, Inc. All rights reserved. The information in this document is subject to change without notice. Cree®, the Cree logo and XLamp® are registered trademarks
and EasyWhite™ is a trademark of Cree, Inc. For product specifications, please see the data sheets available at www.cree.com. For warranty information, please contact Cree Sales
at [email protected]
8
XLAMP CXA2530/CXA2540 RETAIL TRACK LIGHT REFERENCE DESIGN
5. Consider all design possibilities
The design possibilities for an LED-based track light are multitudinous. There are many ways to design the necessary
heat sink that can dissipate the heat and fit within the desired envelope. One such heat sink is demonstrated in this
reference design. There are also many ways to drive the LED and design the reflector and optics. Carefully selecting a
driver and working with a reflector manufacturer to create an appropriate reflector provided the performance necessary
for a true 39-W CMH‑equivalent retail track light.
There are a number of desirable performance-related benefits in this design, which are results of the XLamp CXA2530
LED package. Because the CXA2530 LED uses EasyWhite™ technology, LED-to-LED color consistency can be held to
within two or four McAdam ellipses for any given CCT, depending on the order code. The CXA2530 LED is binned at
85 °C, so the CCT will be as faithful as possible to the system operating environment. These component features allow
for new levels of specification accuracy.
However, the primary purpose of this reference design is to show how simple and straightforward it is to design
with Cree’s XLamp CXA2530 LED. This application note is not intended to show the only way to do this, but instead
demonstrate the ease of implementation with this set of engineering constraints. Certainly numerous other successful
solutions are possible.
Track light manufacturers typically design a reflector for a particular beam angle and install the light source and reflector
in multiple housings. This reference design supports such a process and in addition, the performance range of the
XLamp CXA2530 LED enables a wide variety of luminaires that all use a single CXA2530 LED. For demanding retail
applications, the CXA2530 LED is offered in a 90-minimum CRI option, providing even better color rendering than this
reference design. CCTs from 2700 K to 5000 K and lumen output up to 5900 lm11 are possible, providing the flexibility
to offer a variety of luminaires that use a single LED light source and reflector. This flexibility is enhanced by the XLamp
CXA2540 LED, which has the same physical dimensions and optical source size as the CXA2530 and offers even more
design possibilities.
6. Complete the final steps
This section describes the techniques used to create a working retail track light using the XLamp CXA2530 LED and
shows the results of the design.
Prototyping Details
The essence of the design is to attach a Cree XLamp CXA2530 LED to a heat sink and assemble the necessary optics
and driver around this to create a true 39-W CMH‑equivalent LED luminaire. The assembly steps are detailed below.
11 At 61 W, 85 °C
Copyright © 2013 Cree, Inc. All rights reserved. The information in this document is subject to change without notice. Cree®, the Cree logo and XLamp® are registered trademarks
and EasyWhite™ is a trademark of Cree, Inc. For product specifications, please see the data sheets available at www.cree.com. For warranty information, please contact Cree Sales
at [email protected]
9
height = 21mm
•Can be use with CXA2520 as well.
XLAMP CXA2530/CXA2540 RETAIL TRACK LIGHT REFERENCE DESIGN
•Optical efficiency ~ 89%
•Supplier: Nata (http://www.nata.cn/), Model: 4-1361-1
1. We verified the component dimensions to ensure a correct fit.
•We also used an plastic mounting / alignment ring by: Mekoda
2. We attached the CXA2530 LED to the heat sink with a small amount of thermally conductive compound.12 Thermally
conductive epoxy can also be used.13
3. We fed the driver output wires through the heat sink and, following the
recommendations in Cree’s Soldering and Handling Application Note for the CXA
family of LEDs14, soldered them onto the CXA2530 LED.
4. We tested the connection by applying power to the LED and verified that the
LED lit up.
5. We placed a plastic alignment ring15 over the LED and positioned the ring so the
LED was centered on the heat sink.
6. We secured the plastic alignment ring to the heat sink with screws.
Copyright © 2010, Cree, Inc.
Cree Proprietary & Confidential
pg. 10
7. We secured each end of the driver to the heat sink with a bracket and screw.
8. We fed the driver input wires through the center hole in the screw-in base.
9. We screwed the base to the heat sink, enclosing the driver.
10.We placed the reflector in the heat sink so the opening aligned with the
LED.
11.We placed the cover glass on the reflector and screwed the front optic
cover ring to the heat sink to secure the cover glass and the reflector
to the heat sink.
12.We attached the track adaptor bracket to the lamp assembly with
decorative screws.
13.We connected the driver input wires to the track adaptor.
14.We performed final testing.
12 Dow Corning Thermally Conductive Compound, TC-5026, www.dowcorning.com/content/publishedlit/11-1689a-01.pdf
13Refer to Cree’s Chemical Compatibility application note for compounds that are safe to use with Cree LEDs.
Cree XLamp LED Chemical Compatibility Application Note, AP63, www.cree.com/products/pdf/XLamp_Chemical_Comp.pdf
14 Cree XLamp CXA Family LEDs Soldering and Handling, Application Note AP74, www.cree.com/xlamp_app_notes/CXA_SH
15Model PC, Mekoda Optical Co., Ltd., www.mekoda.cn
Copyright © 2013 Cree, Inc. All rights reserved. The information in this document is subject to change without notice. Cree®, the Cree logo and XLamp® are registered trademarks
and EasyWhite™ is a trademark of Cree, Inc. For product specifications, please see the data sheets available at www.cree.com. For warranty information, please contact Cree Sales
at [email protected]
10
XLAMP CXA2530/CXA2540 RETAIL TRACK LIGHT REFERENCE DESIGN
Results
Thermal Results
We measured the thermal performance of the retail track light by attaching a thermocouple to the XLamp CXA2530 LED
mounted to the heat sink. The TSP of the CXA2530 retail track light was 63.5 °C.
Based on the measured solder point temperature, the TJ can be calculated as follows.
TJ = TSP + (LED power * LED thermal resistance)
TJ = 63.5 °C + (42 W * 0.8 °C/W)
TJ = 97 °C
This thermal performance is in line with the thermal simulation.
Estimated LED Lifetime
Based on thousands of hours of long-term testing of the XLamp CXA2011 LED at higher temperatures than the measured
63.5 °C TSP in this reference design, Cree expects an L70 lifetime for this retail track light significantly longer than the
50,000‑hour goal. 39-W CMH lamps typically have lifetimes ranging from 10,000 to 12,000 hours, so the 4 to 5 times
longer lifetime of the CXA2530 retail track light offers compelling maintenance cost savings.
Optical and Electrical Results
We obtained the results in Table 8 by testing the retail track light in a 1.5‑meter sphere and a Type A goniometer after a
60‑minute stabilization time.16 The performance meets or exceeds the project goals and accomplishes this using a single
XLamp CXA2530 LED to produce a symmetric 16° beam with CBCP exceeding 20,000 cd.
Characteristic
Light output
Light intensity - CBCP
Beam angle - FWHM
Unit
Result
lm
3211
cd
20,470
degrees
16
lm/W
75.5
CCT
K
3048
CRI
100-point scale
80
W
42.6
Luminaire efficacy
Power
Power factor
0.95
Table 8: CXA2530 retail track light results
We also tested the intensity distribution of the CXA2530 retail track light. As shown in Figure 6, the retail track light has
an even intensity distribution for the narrow beam angle.
16 Testing was performed at Cree’s Shenzhen Technology Center. An IES file for the retail track light is available on the Cree website:
www.cree.com/xlamp_app_notes/CXA2530_track_ies
Copyright © 2013 Cree, Inc. All rights reserved. The information in this document is subject to change without notice. Cree®, the Cree logo and XLamp® are registered trademarks
and EasyWhite™ is a trademark of Cree, Inc. For product specifications, please see the data sheets available at www.cree.com. For warranty information, please contact Cree Sales
at [email protected]
11
灯 具 内 系 源 数 只 

上上系实上



实系额源额额

下上系实上



平发平平平平系室室单单
XLAMP
RETAIL TRACK LIGHT
REFERENCE
DESIGN
室CXA2530/CXA2540
内灯具室系室室
























平平系平保系





系光






安安安系










Figure 6: Goniometric intensity polar plot of CXA2530 retail track light
Table 9 shows the center beam illuminance of the CXA2530 retail track light at various distances from the light source.
Height
Center Beam Illuminance
0.5 m
1.7 ft
1.0 m
3.3 ft
1.5 m
5.0 ft
2.0 m
C保系角角: 0系  360系
360系
C保系角角: 15.
15.0系
7,371 fc
系系测系: 79,337
快测 lx
环环环系:23℃
23℃
系系测测:CANDY WONG
1,843
19,834
lx29
系系fc
测测:2012
10
2012
10
Beam Width
Vertical Spread
Horizontal Spread
γ保系角角: 0系  180系
180系
γ保 系 角 角 : 1.0系
15.2 cm
ft
15.2 cm
0.5 ft
系
系系测: 0.5
远远
(EVERFINE)
)GO
A_V1系 测 V2.
EVERFINE
GO2000A
2000
环环环系:50%
50%
系系测测:5.000米
=1.0000]
000米 [K=
=
0000]
30.5
ft 测测实
27.4
0.9 ft
备
备cm
: 系系1.0
系系
测cm
819 fc
8,815 lx
42.7 cm
1.4 ft
42.7 cm
1.4 ft
6.6 ft
461 fc
4,959 lx
57.9 cm
1.9 ft
57.9 cm
1.9 ft
2.5 m
8.3 ft
295 fc
3,173 lx
73.2 cm
2.4 ft
73.2 cm
2.4 ft
3.0 m
9.9 ft
205 fc
2,204 lx
88.4 cm
2.9 ft
88.3 cm
2.8 ft
C:\Documents and Settings\
Settings\ledit\
ledit\Desktop\
Desktop\胡胡系\cxa2530
cxa2530TRACK
2530TRACK_
TRACK_20121029.
20121029.GOS
Table 9: CXA2530 retail track light center beam illuminance – 16° beam angle
Conclusions
This reference design demonstrates the ease of integrating the Cree XLamp CXA2530 LED into a retail track light with
excellent results. Such a luminaire is useful in both retail and residential spot light applications, where enhancing the
appearance of merchandise or artwork is desirable. The performance of this retail track light makes it an attractive
alternative to CMH-based luminaires and could form the basis for a broad product line of CXA2530 LED based track
Copyright © 2013 Cree, Inc. All rights reserved. The information in this document is subject to change without notice. Cree®, the Cree logo and XLamp® are registered trademarks
and EasyWhite™ is a trademark of Cree, Inc. For product specifications, please see the data sheets available at www.cree.com. For warranty information, please contact Cree Sales
at [email protected]
12
XLAMP CXA2530/CXA2540 RETAIL TRACK LIGHT REFERENCE DESIGN
lights. This document is meant to show that this level of performance is achievable with a single XLamp CXA2530 LED
component, and is meant to suggest that the CXA2530 LED can be the basis of numerous successful track light designs.
To further demonstrate this point, the appendix describes the even better results obtained when we subsequently
replaced the XLamp CXA2530 LED in this retail track light with the XLamp CXA2540 LED.
Special thanks
Cree would like to acknowledge and thank the following partner companies for collaborating in the successful prototyping
of this track light.
•
Energy Recovery Products - www.erppowerllc.com
•
Nata Lighting Company Limited - www.nata.cn
Bill of materials
Component
Order Code/Model Number
Company
Web Link
Alignment ring
PC
Mekoda Optical Co., Ltd.
www.mekoda.cn
Driver
ERP040W-1000-39
Energy Recovery Products, Inc.
www.erppowerllc.com
Heat sink/housing, cover glass, screw‑on
base, front optic cover ring kit
GD120-01
Losiwang
www.loswan.cn
LED
CXA2530-0000-000N00T230H
Cree, Inc.
www.cree.com/cxa2530
Reflector
4-1361-1
Nata Lighting Company Limited
www.nata.cn
Thermally conductive compound
TC-5026
Dow Corning Corporation
www.dowcorning.com/content/
publishedlit/11-1689a-01.pdf
Table 10: Bill of materials for CXA2530 retail track light
Copyright © 2013 Cree, Inc. All rights reserved. The information in this document is subject to change without notice. Cree®, the Cree logo and XLamp® are registered trademarks
and EasyWhite™ is a trademark of Cree, Inc. For product specifications, please see the data sheets available at www.cree.com. For warranty information, please contact Cree Sales
at [email protected]
13
XLAMP CXA2530/CXA2540 RETAIL TRACK LIGHT REFERENCE DESIGN
Appendix
The introduction of the Cree XLamp CXA2540 LED expands the possibilities for this retail track light. To demonstrate the
performance available from the CXA2540 LED, we replaced only the LED in the CXA2530 retail track light. The LED in
the original track light was from the highest CXA2530 3000 K flux bin and its replacement, shown in Table 11, was from
the highest CXA2540 3000 K flux bin.
Color
CCT
Range
4000K
3500K
EasyWhite
3000K
2700K
Base Order Codes
Min. Luminous Flux
@ 1100 mA
2-Step Order Code
4-Step Order Code
Group
Flux
(lm) @
85 °C
Flux
(lm) @
25 °C*
V2
4230
4730
V4
4545
5083
W2
4860
5435
CXA2540-0000-000N00W240H
CXA2540-0000-000N00W240F
U4
3955
4423
CXA2540-0000-000N00U435H
CXA2540-0000-000N00U435F
V2
4230
4730
V4
4545
5083
CXA2540-0000-000N00V435H
CXA2540-0000-000N00V435F
U4
3955
4423
CXA2540-0000-000N00U430H
CXA2540-0000-000N00U430F
V2
4230
4730
V4
4545
5083
CXA2540-0000-000N00V430H
CXA2540-0000-000N00V430F
U2
3680
4115
CXA2540-0000-000N00U227H
CXA2540-0000-000N00U227F
U4
3955
4423
V2
4230
4730
Chromaticity
Region
Chromaticity
Region
CXA2540-0000-000N00V240H
40H
35H
30H
27H
CXA2540-0000-000N00V440H
CXA2540-0000-000N00V235H
CXA2540-0000-000N00V230H
CXA2540-0000-000N00U427H
CXA2540-0000-000N00V227H
CXA2540-0000-000N00V240F
40F
35F
30F
27F
CXA2540-0000-000N00V440F
CXA2540-0000-000N00V235F
CXA2540-0000-000N00V230F
CXA2540-0000-000N00U427F
CXA2540-0000-000N00V227F
Table 11: CXA2540 LED order codes
Testing of the CXA2540 retail track light yielded the results shown in Table 12. Operating at the same 1 A current as
the CXA2530 track light, the CXA2540 track light provides a 16% increase in lumen output and a 14% increase in
light intensity. Its 21% increase in luminaire efficacy makes it excellent at highlighting merchandise in retail displays.
Occupying the same footprint as the CXA2530, the CXA2540 offers an even broader range to a retail track light product
line based on CXA2530 and CXA2540 LEDs.
Characteristic
Unit
Result
Light output
lm
3740
Light intensity - CBCP
cd
23,367
degrees
17
Beam angle - FWHM
lm/W
91
CCT
Luminaire efficacy
K
3000
CRI
100-point scale
80
W
41
Power
Power factor
0.95
Table 12: CXA2540 retail track light results
Copyright © 2013 Cree, Inc. All rights reserved. The information in this document is subject to change without notice. Cree®, the Cree logo and XLamp® are registered trademarks
and EasyWhite™ is a trademark of Cree, Inc. For product specifications, please see the data sheets available at www.cree.com. For warranty information, please contact Cree Sales
at [email protected]
14
XLAMP CXA2530/CXA2540 RETAIL TRACK LIGHT REFERENCE DESIGN
We also tested the intensity distribution of the CXA2540 retail track light. As shown in Figure 7, the retail track light has
an even intensity distribution for the narrow beam angle.
Figure 7: Goniometric intensity polar plot of CXA2540 retail track light
Table 13 shows the center beam illuminance of the CXA2540 retail track light at various distances from the light
source. The beam width is nearly identical to the CXA2530 retail track light beam width, with 14% greater center beam
illuminance.
Height
Center Beam Illuminance
Beam Width
Vertical Spread
Horizontal Spread
0.5 m
1.7 ft
8,378 fc
90,180 lx
15.2 cm
0.5 ft
15.2 cm
0.5 ft
1.0 m
3.3 ft
2,094 fc
22,540 lx
30.5 cm
1.0 ft
30.5 cm
1.0 ft
1.5 m
5.0 ft
931 fc
10,021 lx
45.7 cm
1.5 ft
45.7 cm
1.5 ft
2.0 m
6.6 ft
524 fc
5,640 lx
61.0 cm
2.0 ft
61.0 cm
2.0 ft
2.5 m
8.3 ft
335 fc
3,606 lx
76.2 cm
2.5 ft
73.2 cm
2.4 ft
3.0 m
9.9 ft
233 fc
2,508 lx
88.4 cm
2.9 ft
88.4 cm
2.9 ft
Table 13: CXA2540 retail track light center beam illuminance – 17° beam angle
Reliance on any of the information provided in this Application Note is at the user’s sole risk. Cree and its affiliates make no warranties or representations
about, nor assume any liability with respect to, the information in this document or any LED-based lamp or luminaire made in accordance with this
reference design, including without limitation that the lamps or luminaires will not infringe the intellectual property rights of Cree or a third party.
Luminaire manufacturers who base product designs in whole or part on any Cree Application Note or Reference Design are solely responsible for the
compliance of their products with all applicable laws and industry requirements.
Copyright © 2013 Cree, Inc. All rights reserved. The information in this document is subject to change without notice. Cree®, the Cree logo and XLamp® are registered trademarks
and EasyWhite™ is a trademark of Cree, Inc. For product specifications, please see the data sheets available at www.cree.com. For warranty information, please contact Cree Sales
at [email protected]
15