GU10 Reference Design

Cree® XLamp® CXA1304 & CXA1310 LED
GU10 Reference Design
Table of Contents
Introduction
Introduction..................................................................................... 1
Traditional halogen GU10‑base lamps1 are a special type of
Design approach/objectives.......................................................... 2
multifaceted reflector (MR) lamp designed to operate from
The 6-step methodology................................................................. 2
AC line voltage, i.e., 120 or 230 volts. They are used in such
1. Define lighting requirements.................................................. 2
directional residential and commercial lighting applications
2. Define design goals................................................................. 4
as recessed downlights, track lights and retail display lighting.
3. Estimate efficiencies of the optical, thermal & electrical
Previous Cree reference designs demonstrated the viability
systems.................................................................................... 5
of LED technology in low‑voltage MR16 halogen replacement
4. Calculate the number of LEDs................................................ 7
lamps of up to 50‑watt equivalents2 that provided the same or
5. Consider all design possibilities............................................. 7
better range of lumen output, beam angles and center beam
6. Complete the final steps: implementation and analysis....... 8
candle power (CBCP) as traditional halogen lamps while
Conclusion..................................................................................... 13
reducing energy consumption by up to 80% and extending the
Bill of materials............................................................................. 14
service life of the lamps by a factor of over 20. This reference
CLD-AP164 rev 2A
Application Note
design demonstrates that one Cree XLamp® CXA1304 or
www.cree.com/Xlamp
1
2
The subject of the reference design is an MR16 lamp with a GU10 base,
called a GU10 lamp in this document.
Cree XLamp MT-G MR16 LED Reference Design
Cree XLamp XM-L EZW MR16 LED Reference Design
Cree XLamp XP-E MR16 LED Reference Design
Cree XLamp XB-D MR16 LED Reference Design
Cree XLamp MK-R MR16 LED Reference Design
Cree XLamp XQ-D MR16 LED Reference Design
Cree XLamp High-CRI MR16 LED Reference Design
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.
© 2013-2016 Cree, Inc. All rights reserved. The information in this document is subject to change without notice. Cree® and XLamp® are registered
trademarks and the Cree logo is a trademark of Cree, Inc. Cree®, the Cree logo, and XLamp® are registered trademarks of Cree, Inc. ENERGY STAR® is a
registered trademark of the U.S. Environmental Protection Agency. Other trademarks, product, and company names are the property of their respective
owners and do not imply specific product and/or vendor endorsement, sponsorship or association. 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: +1.919.313.5300
1
XLamp ® CXA1304/CXA1310 LED GU10 Reference Design
CXA1310 LED integrated array can be used as the light source for a product line of 35‑watt and 50‑watt equivalent GU10 lamps having
color rendering index (CRI) values in the 80‑90 CRI range, all with a single LED.
Design approach/objectives
In the “LED Luminaire Design Guide” Cree advocates a six‑step framework for creating LED luminaires and lamps. All Cree reference
designs use this framework, and the design guide’s summary table is reproduced below.
Table 1: Cree 6-step framework
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.
The 6-step methodology
The goal of this design is to create two LED-based retrofit GU10 lamps that show the performance available from the XLamp CXA1304
and CXA1310 LED integrated arrays and match the light output of 35‑watt and 50‑watt halogen lamps. An 80‑CRI GU10 lamp has wide
application and is acceptable for all but the most demanding artwork, retail and hospitality applications.
1. Define lighting requirements
Table 2 shows a ranked list of desirable characteristics for a GU10 lamp reference design to address.
© 2013-2016 Cree, Inc. All rights reserved. The information in this document is subject to change without notice. Cree® and XLamp® are registered trademarks and the Cree logo is a trademark of Cree, Inc.
Cree®, the Cree logo, and XLamp® are registered trademarks of Cree, Inc. ENERGY STAR® is a registered trademark of the U.S. Environmental Protection Agency. Other trademarks, product, and company
names are the property of their respective owners and do not imply specific product and/or vendor endorsement, sponsorship or association. 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 ® CXA1304/CXA1310 LED GU10 Reference Design
Table 2: Ranked design criteria for a GU10 lamp
Importance
Critical
Characteristics
Units
Light intensity - CBCP
candelas (cd)
Beam angle - full width half maximum (FWHM)
degrees (°)
Illuminance distribution
footcandles (fc)/lux (lx)
Power
watts (W)
Luminous flux
lumens (lm)
Efficacy
lumens per watt (lm/W)
Form factor
Important
Price
$
Lifetime
hours
Operating temperature
°C
Correlated color temperature (CCT)
K
CRI
100-point scale
Manufacturability
Although ENERGY STAR® does not specify requirements for GU10 lamps, the GU10 lamps in this reference design have the MR16
form factor and we used the ENERGY STAR requirements to help determine the design goals. Table 3 summarizes the ENERGY STAR
requirements for all integral LED lamps.3
Table 3: ENERGY STAR requirements for all lamps
Characteristic
Requirements
Lamp must have one of the following designated CCTs (per ANSI C78.377-2008) consistent with the 7-step chromaticity
quadrangles and Duv tolerances below.
CCT and Duv
Color maintenance
Nominal CCT
Target CCT (K) and Tolerance
2700 K
3000 K
3500 K
4000 K
2725 ± 145
3045 ± 175
3465 ± 245
3985 ± 275
Target Duv and Tolerance
0.000 ±
0.000 ±
0.000 ±
0.001 ±
0.006
0.006
0.006
0.006
The change of chromaticity over the minimum lumen maintenance test period (6,000 hours) shall be within 0.007 on the CIE 1976
(u’, v’) diagram.
CRI
Minimum CRI (Ra) of 80. R9 value must be greater than 0.
Allowable lamp bases
Must be a lamp base listed by ANSI.
Power factor
Lamp power < 5 W and low voltage lamps: no minimum power factor is required
Lamp power > 5 W: power factor must be > 0.70
Note: Power factor must be measured at rated voltage.
Minimum operating temperature
-20 °C or below
LED operating frequency
≥ 120 Hz
Note: This performance characteristic addresses problems with visible flicker due to low frequency operation and applies to steadystate as well as dimmed operation. Dimming operation shall meet the requirement at all light output levels.
Electromagnetic and radio frequency
interference
Must meet appropriate FCC requirements for consumer use (FCC 47 CFR Part 15)
Audible noise
Class A sound rating
Transient protection
Power supply shall comply with IEEE C62.41-1991, 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 voltage
Lamp shall operate at rated nominal voltage of 120, 240 or 277 VAC, or at 12 or 24 VAC or VDC.
3ENERGY STAR® Program Requirements for Integral LED Lamps Eligibility Criteria – Version 1.4, Table 4,
www.energystar.gov/ia/partners/product_specs/program_reqs/Integral_LED_Lamps_Program_Requirements.pdf
© 2013-2016 Cree, Inc. All rights reserved. The information in this document is subject to change without notice. Cree® and XLamp® are registered trademarks and the Cree logo is a trademark of Cree, Inc.
Cree®, the Cree logo, and XLamp® are registered trademarks of Cree, Inc. ENERGY STAR® is a registered trademark of the U.S. Environmental Protection Agency. Other trademarks, product, and company
names are the property of their respective owners and do not imply specific product and/or vendor endorsement, sponsorship or association. 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 ® CXA1304/CXA1310 LED GU10 Reference Design
Table 4 summarizes the ENERGY STAR requirements for replacement MR16 lamps.4
Table 4: ENERGY STAR requirements for MR16 lamps
Criteria Item
ENERGY STAR Requirements
Definition
Directional lamp means a lamp having at least 80% light output within a solid angle of ∏ sr (corresponding to a cone with angle of
120°)
Minimum luminous efficacy
Lamp diameter < 20/8 inch: 40 lm/W
Lamp diameter > 20/8 inch: 45 lm/W
Color spatial uniformity
The variation of chromaticity within the beam angle shall be within 0.006 from the weighted average point on the CIE 1976 (u’, v’)
diagram.
Maximum lamp diameter
Not to exceed target lamp diameter
Maximum overall length (MOL)
Not to exceed MOL for target lamp
Minimum center beam intensity
PAR and MR16 lamps
Link to online tool at
www.energystar.gov/ia/products/lighting/iledl/IntLampCenterBeamTool.zip
MR16 lamps
Lumen maintenance
> 70% lumen maintenance (L70) at 25,000 hours of operation
Rapid-cycle stress test
Cycle times must be 2 minutes on, 2 minutes off. Lamp will be cycled once for every 2 hours of L70 life.
We found inconsistency in the performance data available for GU10 lamps. Table 5 shows performance data for four halogen GU10
lamps, gleaned from GU10 and MR16 data sheets available publicly. There is a substantial difference in the luminous flux of these four
lamps from four manufacturers, even for the lamps that use the same power. The yearly energy cost was calculated by assuming the lamp
is lit three hours a day and that electricity costs 11 cents per kilowatt hour.
Table 5: Halogen GU10 comparison data
Source
GU10 Lamp A
Lamp
Power
(W)
Luminous
Flux
(lm)
Efficacy
(lm/W)
CCT (K)
35
320
9.1
3000
GU10 Lamp B
35
265
7.6
2750
GU10 Lamp C
50
590
11.8
3000
GU10 Lamp D
50
790
15.8
CRI
100
100
CBCP (cd)
Beam Angle
(°)
Lifetime
(B50 hours)
Estimated Yearly Energy
Cost ($)
1800
25
2000
4.22
800
2500
25
1500
4.22
25
2000
6.02
24
3000
6.02
2. Define design goals
The aims of this project are a 35‑W and a 50‑W equivalent GU10 lamp, each with an 20° beam angle, using the XLamp CXA1304 and
CXA1310 LED integrated arrays. We used the ENERGY STAR Center Beam Intensity Tool to determine the CBCP such MR16 lamps need
to provide. Table 6 shows the design goals for this project.
4
Ibid., Table 7C
© 2013-2016 Cree, Inc. All rights reserved. The information in this document is subject to change without notice. Cree® and XLamp® are registered trademarks and the Cree logo is a trademark of Cree, Inc.
Cree®, the Cree logo, and XLamp® are registered trademarks of Cree, Inc. ENERGY STAR® is a registered trademark of the U.S. Environmental Protection Agency. Other trademarks, product, and company
names are the property of their respective owners and do not imply specific product and/or vendor endorsement, sponsorship or association. 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 ® CXA1304/CXA1310 LED GU10 Reference Design
Table 6: GU10 design goals
Characteristic
Unit
CXA1304 GU10
CXA1310 GU10
lm
400
720
3296
Light output
Center beam candle power (CBCP) - 20°
cd
2272
degrees (°)
20
20
lm/W
50
60
Power
W
8
12
CCT
K
3000
3000
CRI
100-point scale
80, R9 > 0
80, R9 > 0
≥ 0.7
> 0.7
Beam angle
Lamp efficacy
Power factor
3. Estimate efficiencies of the optical, thermal & electrical systems
We used Cree’s Product Characterization Tool (PCT) tool to determine the drive currents for the design. For the CXA1304 lamp, we
estimated 85% optical efficiency, 86% driver efficiency and a case temperature (TC) of 55 °C. For the CXA1310 lamp, we estimated 85%
optical efficiency, 83% driver efficiency and a TC of 85 °C.
The PCT data highlighted in Figure 1 shows the current levels at which the XLamp
1 LEDs provide light output that meets the design goals.
1
LED 1
LED 1
Current (A)
$
Price
SYS lm tot SYS lm/W
0.100
0.110
0.120
0.130
0.140
0.150
0.160
0.170
338.3
364.7
390.1
414.4
437.7
460
481.3
501.7
Flux
B2 [380]
77.3
74.9
72.7
70.6
68.5
66.6
64.7
62.9
Tc (ºC)
LED Vf
37.63
38.05
38.46
38.86
39.24
39.62
39.99
40.35
55
LED W
3.763
4.185
4.615
5.051
5.494
5.943
6.398
6.86
Model
Cree XLamp CXA1310 LES 6r 37V {EZW}
Current (A)
Model
Cree XLamp CXA1304 LES 6r 37V {EZW}
$
Price
SYS lm tot SYS lm/W
0.230
0.240
0.250
0.260
0.270
0.280
0.290
0.300
663
687.3
711.3
735
758.4
781.5
804.4
827
Flux
Tc (ºC)
J4 [1120]
69.4
68.7
68.1
67.5
66.9
66.3
65.7
65.1
LED Vf
34.49
34.58
34.68
34.77
34.87
34.96
35.04
35.13
85
LED W
7.932
8.3
8.67
9.041
9.414
9.788
10.162
10.539
Figure 1: PCT view of drive current and lumen levels: left - CXA1304 lamp, right - CXA1310 lamp
Thermal Requirements
Typical of Cree’s MR16 reference designs, the heat sink of this GU10 lamp must be able to dissipate the necessary heat and serve as the
mechanical housing for the other lamp components. We selected a commercially available aluminum heat sink that fits the compact form
factor. The heat sink is part of a kit, shown in Figure 2, that also includes an optic holder and plastic base.5
5
Model: Cree_MT-G_GU10_refdes, Huizhou Taison Precision Parts Co., Ltd.,
www.hztaisun.com/productled_detail.aspx?t=mech&id=312
© 2013-2016 Cree, Inc. All rights reserved. The information in this document is subject to change without notice. Cree® and XLamp® are registered trademarks and the Cree logo is a trademark of Cree, Inc.
Cree®, the Cree logo, and XLamp® are registered trademarks of Cree, Inc. ENERGY STAR® is a registered trademark of the U.S. Environmental Protection Agency. Other trademarks, product, and company
names are the property of their respective owners and do not imply specific product and/or vendor endorsement, sponsorship or association. 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 ® CXA1304/CXA1310 LED GU10 Reference Design
Figure 2: GU10 heat sink/housing kit components: left - heat sink/housing, center - optic holder, right: plastic base
Figure 3 and Figure 4 show the results of the thermal simulation of the design. The CXA1304 lamp, operating at 5.2 W, had a 68 °C
estimated case temperature (Tc). The CXA1310 lamp, operating at 9.4 W, had a 92 °C estimated Tc. Both temperatures are within the
operating limit curve for each respective LED integrated array.6
Figure 3: CXA1304 GU10 thermal simulation: left - side view, center & right - bottom view with and without optic and optic holder
Figure 4: CXA1310 GU10 thermal simulation: left - side view, center & right - bottom view with and without optic and optic holder
6
For additional information on thermal management, refer to the Thermal Management of Cree XLamp LEDs Application Note.
© 2013-2016 Cree, Inc. All rights reserved. The information in this document is subject to change without notice. Cree® and XLamp® are registered trademarks and the Cree logo is a trademark of Cree, Inc.
Cree®, the Cree logo, and XLamp® are registered trademarks of Cree, Inc. ENERGY STAR® is a registered trademark of the U.S. Environmental Protection Agency. Other trademarks, product, and company
names are the property of their respective owners and do not imply specific product and/or vendor endorsement, sponsorship or association. 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 ® CXA1304/CXA1310 LED GU10 Reference Design
Driver
The driver for this GU10 lamp is located inside the lamp base. We used a custom non‑isolated
constant‑current driver, shown in Figure 5, that fits within the compact GU10 form factor.7 For the
driver for the CXA1310 lamp, we modified the sense resistors and driver integrated circuit (IC) to
increase the current to the level needed.
Figure 5: GU10 driver
Secondary Optics
We used a 30‑mm off‑the‑shelf total internal reflection (TIR) optic, shown in Figure 6, for
both GU10 lamps.8
Figure 6: GU10 optic
The CXA LED Design Guide provides basic information on the requirements to use Cree XLamp CXA LEDs successfully in luminaire
designs.
4. Calculate the number of LEDs
The performance of the XLamp CXA1304 and CXA1310 LED integrated arrays enable the use of a single LED component in GU10 lamps
that better the light output of halogen lamps.
5. Consider all design possibilities
The XLamp CXA1304 and CXA1310 LED integrated arrays used in this reference design offer a wide range of color temperatures. As
highlighted in Table 7 and Table 8, we selected warm white LEDs for this GU10 lamp design.
Table 7: CXA1304 LED integrated array order codes
Base Order Codes
Min. Luminous Flux
@ 100 mA
CRI
CCT
Range
Min
Typ
80
---
93
95
3000 K
7
8
Group
Flux (lm)
@ 85 °C
Flux (lm)
@ 25 °C
A4
355
396
B2
380
423
84
268
297
92
286
317
2-Step Order Code
Chromaticity
Region
30H
30H
4-Step Order Code
Chromaticity
Region
CXA1304-0000-000N00A430H
CXA1304-0000-000N00B230H
CXA1304-0000-000N0Y8430H
CXA1304-0000-000N0Y9230H
30F
30F
CXA1304-0000-000N00A430F
CXA1304-0000-000N00B230F
CXA1304-0000-000N0Y8430F
CXA1304-0000-000N0Y9230F
Model DER-387, Power Integrations, www.powerint.com/sites/default/files/PDFFiles/der387.pdf
Model 10756, Carclo Optics, www.carclo-optics.com/optic-10756?opticfamily=30mm
© 2013-2016 Cree, Inc. All rights reserved. The information in this document is subject to change without notice. Cree® and XLamp® are registered trademarks and the Cree logo is a trademark of Cree, Inc.
Cree®, the Cree logo, and XLamp® are registered trademarks of Cree, Inc. ENERGY STAR® is a registered trademark of the U.S. Environmental Protection Agency. Other trademarks, product, and company
names are the property of their respective owners and do not imply specific product and/or vendor endorsement, sponsorship or association. 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 ® CXA1304/CXA1310 LED GU10 Reference Design
Table 8: CXA1310 LED integrated array order codes
Base Order Codes
Min. Luminous Flux
@ 100 mA
CRI
CCT
Range
Min
Typ
80
---
93
95
3000 K
Group
Flux (lm)
@ 85 °C
Flux (lm)
@ 25 °C
J2
1040
1165
J4
1120
1255
G2
780
881
G4
840
941
2-Step Order Code
Chromaticity
Region
30H
30H
4-Step Order Code
Chromaticity
Region
CXA1310-0000-000N00J230H
CXA1310-0000-000N00J430H
CXA1310-0000-000N0YG230H
CXA1310-0000-000N0YG430H
30F
30F
CXA1310-0000-000N00J230F
CXA1310-0000-000N00J430F
CXA1310-0000-000N0YG230F
CXA1310-0000-000N0YG430F
6. Complete the final steps: implementation and analysis
Using the methodology described above, we determined a suitable combination of components and drive conditions to meet the design
goals. This section describes how Cree assembled the GU10 lamps and shows the results of the design.
Prototyping Details
1. Following the recommendations in the Cree CXA Family Soldering and Handling Application Note, we soldered the LED input wires
to the LED.
2. We attached the LED to the heat sink using thermal adhesive.9
3. We fed the LED input wires through the heat sink and soldered them to the driver.
4. We soldered the driver input wires to the connections for the two pins projecting from the base.
5. We inserted the driver into the plastic base and attached the base to the heat sink with room temperature vulcanizing (RTV) silicone.10
6. We attached the optic to the optic holder with optical silicone.
7. We snapped the optic holder and optic into place on the heat sink.
8. We performed final testing.
Results
Thermal Results
Cree verified the case temperature with a thermocouple to confirm that the thermal dissipation performance of the heat sink is sufficient.
Figure 7 shows the Tc of the CXA1304 and CXA1310 over time compared to the ambient temperature (Tamb).
9 Arctic Silver Thermal Adhesive, Arctic Silver, Inc., www.arcticsilver.com/arctic_silver_thermal_adhesive.htm
10 SE 9185 White, Dow Corning Corporation, www3.dowcorning.com/DataFiles/090007c8802d7bdc.pdf
© 2013-2016 Cree, Inc. All rights reserved. The information in this document is subject to change without notice. Cree® and XLamp® are registered trademarks and the Cree logo is a trademark of Cree, Inc.
Cree®, the Cree logo, and XLamp® are registered trademarks of Cree, Inc. ENERGY STAR® is a registered trademark of the U.S. Environmental Protection Agency. Other trademarks, product, and company
names are the property of their respective owners and do not imply specific product and/or vendor endorsement, sponsorship or association. 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 ® CXA1304/CXA1310 LED GU10 Reference Design
80
100
Average Tc: 68.1 °C
70
90
70
50
Temperature (°C)
Temperature (°C)
Average T_c: 88°C
80
60
Tc
Tamb
40
30
Average Tamb: 22.7 °C
T_c
T_amb
60
50
40
30
20
20
10
Average T_amb: 21°C
10
0
0:00:00
0:15:00
0:30:00
0:45:00
1:00:00
0
0:00:00
1:15:00
0:15:00
0:30:00
Time (h:mm:ss)
0:45:00
Time (h:mm:ss)
1:00:00
1:15:00
1:30:00
Figure 7: GU10 thermal performance: left - CXA1304 GU10, right - CXA1310 GU10
Figure 8 shows the Tc of the GU10 lamps on each LED integrated array’s operating limit graph. In each graph, the plotted line is the
maximum operating condition for the component. The operating conditions for the LED integrated array, i.e., LED drive current and Tc,
300
600
250
500
200
400
If (mA)
If (mA)
must be below the line. The Tc of each GU10 lamp is within the operating limit curve for the respective LED integrated array.
150
300
100
200
50
100
0
0
0
25
50
75
100
Case Temperature (°C)
125
150
0
25
50
75
100
125
150
Case Temperature (°C)
Figure 8: GU10 Tc compared to operating limits: left - CXA1304, right - CXA1310
Estimated LED Lifetime
We used the Environmental Protection Agency (EPA ) TM-21 Calculator to determine the calculated and reported lifetimes for the XLamp
CXA1304 LED integrated array at a 137‑mA input current and a 68 °C case temperature. The duration of Cree’s CXA1304 LM-80 data set
is 6,048 hours at 200 mA and 85 °C. The TM-21 methodology limits the projection to six times the duration of the LM-80 data set.
With a reported L70 lifetime greater than 36,000 hours, a calculated L70 lifetime of 120,000 hours and reported and calculated L90
lifetime of 33,000 hours for the CXA1304 LED, we expect the CXA1304 GU10 lamp to easily exceed the ENERGY STAR L70 lifetime
requirement of 25,000 hours.
The reported L70 and L90 lifetimes of the CXA1304 LED integrated array are more than sixteen times longer than the lifetimes of the
two comparison 35-W GU10 lamps. GU10 lamps that operate on line voltage typically have shorter lifetimes than standard MR16 lamps
© 2013-2016 Cree, Inc. All rights reserved. The information in this document is subject to change without notice. Cree® and XLamp® are registered trademarks and the Cree logo is a trademark of Cree, Inc.
Cree®, the Cree logo, and XLamp® are registered trademarks of Cree, Inc. ENERGY STAR® is a registered trademark of the U.S. Environmental Protection Agency. Other trademarks, product, and company
names are the property of their respective owners and do not imply specific product and/or vendor endorsement, sponsorship or association. For product specifications, please see the data sheets available
at www.cree.com. For warranty information, please contact Cree Sales at [email protected].
9
XLamp ® CXA1304/CXA1310 LED GU10 Reference Design
because GU10 lamps use a thinner filament. A low‑voltage/high‑current 12‑V MR16 lamp requires a thicker, and therefore more reliable,
tungsten filament than a high‑voltage/low‑current GU10 lamp operating on 120 V.
Optical and Electrical Results
Cree’s testing of the GU10 lamps yielded the results in Table 9.11 As the table shows, each lamp exceeds its CBCP and light-output
targets using approximately 12% (for the CXA1304 lamp) to 22% (for the CXA1310 lamp) of the energy of the comparison halogen GU10
lamps. These energy savings produce a corresponding cost savings. The CXA1310 GU10 lamp not only betters the ENERGY STAR CBCP
requirements for a 50‑W MR16 lamp but also has CBCP that is 25% greater than the 3406‑cd ENERGY STAR requirement for a 75‑W MR16
lamp with a 21 ° beam angle.
Table 9: GU10 lamp steady-state results
Characteristic
Result
Unit
Lamp A
Lamp B
Target
CXA1304 GU10
CXA1310 GU10
Light output
lm
320
265
400
426
753
CBCP
cd
1800
800
2272
2410
4294
Beam angle
degrees
25
25
20
21
21
lm/W
9.1
7.6
50
72.2
69.1
Lamp efficacy
Power
W
35
35
8
5.9
10.9
CCT
K
3000
2750
3000
3117
3088
CRI
100-point scale
100
80, R9 > 0
83, R9 = 14
84, R9 = 13
> 0.7
0.72
0.80
37
75
0.71
1.39
Power factor
ENERGY STAR equivalency
W
Estimated yearly energy cost - lamp lit 3 hrs/day,
$0.11/kWh
$
4.22
4.22
In an effort to demonstrate a 50‑W equivalent GU10 lamp, we made two additional GU10 lamps, each using a CXA1304 LED from a higher
flux bin, as shown in Table 10. The lamps use the same complementary components as the 35‑W equivalent CXA1304 GU10 lamp, but
operate at a slightly higher current, 155 mA.
Table 10: Additional CXA1304 LED integrated array order codes
CCT
Range
Min
3000 K
Base Order Codes
Min. Luminous Flux
@ 100 mA
CRI
80
Typ
---
Group
Flux (lm)
@ 85 °C
Flux (lm)
@ 25 °C
A4
355
396
B2
380
423
B4
410
457
C2
440
490
2-Step Order Code
Chromaticity
Region
4-Step Order Code
Chromaticity
Region
CXA1304-0000-000N00A430H
30H
CXA1304-0000-000N00B230
CXA1304-0000-000N00B430H
CXA1304-0000-000N00C230H
CXA1304-0000-000N00A430F
30F
CXA1304-0000-000N00B230F
CXA1304-0000-000N00B430F
CXA1304-0000-000N00C230F
11 Testing was performed in a 2‑meter integrating sphere at Cree’s Santa Barbara Technology Center and in a type C goniometer at Cree’s Durham Technology Center.
CXA1304 GU10 IES file
CXA1310 GU10 IES file
© 2013-2016 Cree, Inc. All rights reserved. The information in this document is subject to change without notice. Cree® and XLamp® are registered trademarks and the Cree logo is a trademark of Cree, Inc.
Cree®, the Cree logo, and XLamp® are registered trademarks of Cree, Inc. ENERGY STAR® is a registered trademark of the U.S. Environmental Protection Agency. Other trademarks, product, and company
names are the property of their respective owners and do not imply specific product and/or vendor endorsement, sponsorship or association. 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 ® CXA1304/CXA1310 LED GU10 Reference Design
As shown in Table 11 one of the additional lamps exceeds the ENERGY STAR requirement for a 35‑W MR16 lamp. The other exceeds the
3062‑cd ENERGY STAR requirement for a 50‑W MR16 lamp with a 21° beam angle. Each lamp used 20% of the power of the comparison
halogen GU10 lamps.
Table 11: Additional GU10 lamp steady-state results
Target
Characteristic
Light output
CBCP
Beam angle
Lamp efficacy
Power
Unit
Result
50-W Equivalent
CXA1304 GU10
B4◊
CXA1304 GU10
C2
lm
720
504
541
cd
3296
2863*
3074*
degrees
20
21*
21*
lm/W
60
73.5
78.9
W
12
6.9
6.9
CCT
K
3000
3034
3034
CRI
100-point scale
80, R9 > 0
84, R9=15
84, R9=15
> 0.7
Power factor
0.76
0.76
ENERGY STAR equivalency
W
42
50
Estimated yearly energy cost lamp lit 3 hrs/day, $0.11/kWh
$
0.83
0.83
*
◊
Results estimated based on 37‑W and 75‑W equivalent CXA1304/CXA1310 GU10s
Results calculated using the PCT
This reference design chose to emphasize the light output that can be produced by CXA1304 and CXA1310 GU10 lamps. As mentioned
in the previous section, Cree’s LM-80 data for the XLamp CXA1304 LED integrated array at 85 °C and 200 mA indicates that the CXA1304
GU10 lamp easily betters the ENERGY STAR MR16 lifetime requirement and greatly exceeds the lifetime of halogen lamps. Cree expects
that LM-80 data for the CXA1310 LED integrated array will yield similar results.
The polar candela distributions in Figure 9 shows an even intensity distribution for the GU10 lamps.
Figure 9: Polar candela distribution of GU10 lamps: left - CXA1304 37‑W equivalent, right - CXA1310 75‑W equivalent
© 2013-2016 Cree, Inc. All rights reserved. The information in this document is subject to change without notice. Cree® and XLamp® are registered trademarks and the Cree logo is a trademark of Cree, Inc.
Cree®, the Cree logo, and XLamp® are registered trademarks of Cree, Inc. ENERGY STAR® is a registered trademark of the U.S. Environmental Protection Agency. Other trademarks, product, and company
names are the property of their respective owners and do not imply specific product and/or vendor endorsement, sponsorship or association. For product specifications, please see the data sheets available
at www.cree.com. For warranty information, please contact Cree Sales at [email protected].
11
XLamp ® CXA1304/CXA1310 LED GU10 Reference Design
Figure 10 is another indication of the even light distribution of the CXA1304 GU10 lamp. The image is of the light pattern of the CXA1304
GU10 lamp on a white wall. The lamp was mounted facing and perpendicular to the wall.
Figure 11 is a false color representation of the CXA1304 GU10 light pattern. The legend below the diagram gives the illumination values
the colors represent.
Figure 10: GU10 light pattern
Figure 11: GU10 false color diagram
Table 12 shows the illuminance of the CXA1304 GU10 lamp at various distances from the light source.
Table 12: CXA1304 37‑W equivalent GU10 lamp – 21° beam angle
Height
Center Beam Illuminance
Beam Width
0.5 m
1.6 ft
895.7 fc
9,641.6 lx
0.2 m
0.7 ft
1.0 m
3.3 ft
223.9 fc
2,410.4 lx
0.4 m
1.3 ft
1.5 m
4.9 ft
99.5 fc
1,071.3 lx
0.5 m
1.6 ft
2.0 m
6.6 ft
56.0 fc
602.6 lx
0.7 m
2.3 ft
2.5 m
8.2 ft
35.8 fc
385.7 lx
0.9 m
3.0 ft
3.0 m
9.8 ft
24.9 fc
267.8 lx
1.1 m
3.6 ft
© 2013-2016 Cree, Inc. All rights reserved. The information in this document is subject to change without notice. Cree® and XLamp® are registered trademarks and the Cree logo is a trademark of Cree, Inc.
Cree®, the Cree logo, and XLamp® are registered trademarks of Cree, Inc. ENERGY STAR® is a registered trademark of the U.S. Environmental Protection Agency. Other trademarks, product, and company
names are the property of their respective owners and do not imply specific product and/or vendor endorsement, sponsorship or association. 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 ® CXA1304/CXA1310 LED GU10 Reference Design
Table 13 shows the illuminance of the CXA1310 GU10 lamp at various distances from the light source.
Table 13: CXA1310 75‑W equivalent GU10 lamp – 21° beam angle
Height
Center Beam Illuminance
Beam Width
0.5 m
1.6 ft
1,569.4 fc
16,892.9 lx
0.2 m
0.7 ft
1.0 m
3.3 ft
392.3 fc
4,222.7 lx
0.4 m
1.3 ft
1.5 m
4.9 ft
174.4 fc
1,877.2 lx
0.5 m
1.6 ft
2.0 m
6.6 ft
98.1 fc
1,055.9 lx
0.7 m
2.3 ft
2.5 m
8.2 ft
62.8 fc
676.0 lx
0.9 m
3.0 ft
3.0 m
9.8 ft
43.6 fc
436.3 lx
1.1 m
3.6 ft
Conclusion
This reference design illustrates the excellent performance, in terms of both energy efficiency and color quality, of 35‑W and 50‑W
equivalent GU10 lamps based on the Cree XLamp CXA1304 and CXA1310 LED integrated arrays. The ability of these LEDs to provide
ENERGY STAR light output levels demonstrates the possibility of using XLamp LED‑based GU10 lamps in lighting applications that require
good color rendering. An added benefit is the energy cost savings these lamps provide compared to their halogen equivalents. With color
temperatures from 2700 K to 5000 K and lumen output up to 1,000 lm for the CXA1304 and 2,700 lm for the CXA1310, these LED integrated
arrays offer the possibility of a product line of GU10 lamps based on a single XLamp LED footprint. The lighting-class performance of the
Cree XLamp CXA1304 and CXA1310 LED integrated arrays makes them a viable and attractive design option for LED-based GU10 lamps.
© 2013-2016 Cree, Inc. All rights reserved. The information in this document is subject to change without notice. Cree® and XLamp® are registered trademarks and the Cree logo is a trademark of Cree, Inc.
Cree®, the Cree logo, and XLamp® are registered trademarks of Cree, Inc. ENERGY STAR® is a registered trademark of the U.S. Environmental Protection Agency. Other trademarks, product, and company
names are the property of their respective owners and do not imply specific product and/or vendor endorsement, sponsorship or association. 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 ® CXA1304/CXA1310 LED GU10 Reference Design
Bill of materials
Table 14: Bill of materials for CXA1304 and CXA1310 GU10 lamps
Component
Company
Order Code/Model Number
Web Link
Power Integrations
DER-387
www.powerint.com/sites/default/files/PDFFiles/der387.pdf
Heat sink/housing,
optic holder, base
Huizhou Taison Precision Parts Co., Ltd.
MT-G_GU10_refdes
www.hztaisun.com/productled_detail.aspx?t=mech&id=312
Cree, Inc.
CXA1304-0000-000N00B230F
CXA1304-0000-000N00B430F
CXA1304-0000-000N00C230F
CXA1310-0000-000N00J430F
CXA1304 product page
LED integrated array
Carclo Optics
10756
www.carclo-optics.com/optic-10756?opticfamily=30mm
RTV silicone
Dow Corning Corporation
SE 9185 White
www3.dowcorning.com/DataFiles/090007c8802d7bdc.pdf
Thermal adhesive
Arctic Silver, Inc.
Arctic Silver Thermal Adhesive
www.arcticsilver.com/arctic_silver_thermal_adhesive.htm
Driver
CXA1310 product page
Optic
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.
© 2013-2016 Cree, Inc. All rights reserved. The information in this document is subject to change without notice. Cree® and XLamp® are registered trademarks and the Cree logo is a trademark of Cree, Inc.
Cree®, the Cree logo, and XLamp® are registered trademarks of Cree, Inc. ENERGY STAR® is a registered trademark of the U.S. Environmental Protection Agency. Other trademarks, product, and company
names are the property of their respective owners and do not imply specific product and/or vendor endorsement, sponsorship or association. For product specifications, please see the data sheets available
at www.cree.com. For warranty information, please contact Cree Sales at [email protected].
14