CREE CLD-AP72

application note
Cree® XLamp® A19 Reference Overview
Table of Contents
Introduction
Introduction......................................................... 1
Within the past year the LED industry has begun
A19 Lighting Requirements.................................... 2
producing white, high power LEDs in sufficient volume
Design Goals........................................................ 6
that value-priced light bulbs are now practical consumer
Estimate Efficiencies............................................. 7
products. In North America many retailers now have
Implementations and Analysis...............................10
LED bulbs as part of their inventory of lighting products.
CLD-AP72 rev 0B
The 3 snow cones
Conclusions........................................................12
Most LED replacement lamps or LED light bulbs pose
significant
design
problems
in
managing
thermal
equilibrium. These problems were always less severe for
gas discharge and filament lamps because these lamps
are inherently convective and dissipate heat through
www. cree.com/Xlamp
the same path as the light. LEDs, whose thermal load
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.
Other trademarks,
product
and
names are
property of
respectiveisowners
do not imply
specific
product and/or vendor
Copyright
© 2010 Cree,
Inc.
Allcompany
rights reserved.
Thethe
information
in their
this document
subjectand
to change
without
notice.
endorsement,
or association.
Cree,
the Cree sponsorship
logo and XLamp
are registered trademarks of Cree, Inc.
Copyright © 2011-2012 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. 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
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XLamp a19 Reference Design
is dissipated through conduction, must have a separate path and heat sink for thermal dissipation. Hence the design
constraints that come with replacement lamps.
A great deal of interest and activity has centered on the E26/A19 form factor and there are many ways to approach the
design and production of the classic A19 bulb. This application note reviews a variety of LED choices available from Cree
to achieve attractive and cost effective warm white A19 bulbs or replacement lamps. This application note is different
from other Cree application notes in that it reviews a spectrum of design choices rather than focusing on a particular
implementation.
While most Cree reference designs or application notes use a 6-step framework, described in the “LED Luminaire Design
Guide,”1 this application note is largely about the many LED options and topologies that are available when designing
A19 LED replacement lamps. As such we only visit a few of the steps in the framework.
A19 Lighting Requirements
The most common form of A19 LED replacement lamps are often referred to as “snow cones.” This moniker comes
from the hemispheric dome that covers a circuit board of LEDs that sit atop a conic heat sink, which gives the visual
impression of an ice cream cone or snow cone. The benefits of this approach come from a relatively large set of suppliers,
delivering form-factor appropriate heat sinks, device drivers and molded diffusers. As such, this style of A19 bulb has
rapidly become the dominant value-priced bulb. For many lighting applications the hemispheric distribution of luminous
flux that comes along with the snow cone approach is sufficient – a very wide-angle flood lamp. But for applications that
require a spherical or omnidirectional distribution of flux, the snow cone is not optimal.2
In order to achieve an omnidirectional flux distribution, other approaches to flux geometry must be used. Noteworthy
or innovative examples of these designs include bulbs from GE, Philips and LSG, shown below.
1
2
LED Luminaire Design Guide, Application Note AP15, www.cree.com/xlamp_app_notes/luminaire_design_guide. The guide
advocates a 6-step approach consisting of:
1.
Define lighting requirements
2.
Define lighting goals
3.
Estimate efficiencies of optical, thermal and electrical systems
4.Calculate the number of LEDs needed
5.Consider all the design possibilities and choose the best
6.
Complete the final steps
The US Environmental Protection Agency defines the omnidirectional requirements in ENERGY STAR® Program Requirements
for Integral LED Lamps, www.energystar.gov/ia/partners/product_specs/program_reqs/ILL_prog_reqs.pdf. Table 4, p3, applies to
all lamps; Table 6, p9, applies to “Non-Standard” Lamps – snow cone bulbs fall into this category, and Table 7A, p10, applies to
omnidirectional lamps.
Copyright © 2011-2012 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. 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 a19 Reference Design
Figure 1: Omnidirectional Bubls from GE, LSG and Phillips3
The following table summarizes requirements to be met to be eligible to qualify for the Energy Star® Program.
Characteristic
Requirement
The lamp must have one of the following designated CCTs (per ANSI C78.377-2008)
consistent with the 7-step chromaticity quadrangles below.
CCT
Color Maintenance
CRI
2700 K
3000 K
3500 K
4000 K
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.
Minimum CRI (Ra) of 80. R9 value must be greater than 0.
Lamps may be dimmable or non-dimmable. Product packaging must clearly indicate
Dimming
whether the lamp is dimmable or not dimmable. Manufacturers qualifying dimmable
products must maintain a Web page providing dimmer compatibility information.
Warranty
3-year warranty for luminaires with replaceable drivers.
Allowable Lamp Bases
Must be a lamp base listed by ANSI.
Power Factor (PF)
Minimum Operating Temperature
Lamp power < 5 W and low voltage lamps: no minimum PF
Lamp power > 5 W: PF > 0.7
-20°C or below
LED operating frequency ≥ 120 Hz
LED Operating Frequency
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.
3
The illustration shows the GE Energy Smart LED Bulb, a 40-W equivalent LSG Definity A19 bulb and the Phillips Endura bulb.
Copyright © 2011-2012 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. 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 a19 Reference Design
Characteristic
Requirement
Electromagnetic and Radio Frequency
Must meet appropriate FCC requirements for consumer use (FCC 47 CFR Part 15)
Interference
Audible Noise
Class A sound rating
Power supply shall comply with IEEE C62.41-1991, Class A operation. The line transient
Transient Protection
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.
Table 1: Energy Star requirements for all integral LED lamps
This table summarizes the Energy Star requirements for non-standard LED lamps.
Characteristic
Minimum luminous efficacy
Minimum light output
Luminous intensity distribution
Lumen maintenance
Rapid-cycle stress test
Requirement
LED lamp power < 10 W: 50 lm/W
LED lamp power > 10 W: 55 lm/W
200 lumens
No specific distribution is required. Must submit goniophotometry report showing luminous
intensity distribution produced by the lamp.
L70 > 25,000 hours
Cycle times must be 2 minutes on, 2 minutes off. Lamp will be cycled once for every 2
hours of required minimum L70 life.
Table 2:Energy Star requirements for non-standard LED lamps
The following table summarizes the Energy Star requirements for omnidirectional lamps.
Characteristic
Minimum luminous efficacy
Requirement
LED lamp power < 10 W: 50 lm/W
LED lamp power > 10 W: 55 lm/W
200 lumens
Minimum light output
Nominal wattage of lamp to be replaced
Minimum initial light output of LED lamp
(watts)
(lumens)
25
200
35
325
40
450
60
800
75
1100
100
1600
125
2000
150
2600
Copyright © 2011-2012 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. 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 a19 Reference Design
Characteristic
Requirement
Products shall have an even distribution of luminous intensity (candelas) within the 0° to
135° zone (vertically axially symmetrical).
Luminous intensity at any angle within this zone shall not differ from the mean luminous
Luminous intensity distribution
intensity for the entire 0° to 135° zone by more than 20%.
At least 5% of total flux (lumens) must be emitted in the 135°-180° zone.
Distribution shall be vertically symmetrical as measured in three vertical planes at 0°, 45°
and 90°.
Maximum lamp diameter
Not to exceed target lamp diameter as per ANSI C78.20-2003.
Maximum overall length (MOL)
Not to exceed MOL for target lamp as per ANSI C78.20-2003.
Lumen maintenance
L70 > 25,000 hours
Rapid-cycle stress test
Color angular uniformity
Cycle times must be 2 minutes on, 2 minutes off. Lamp will be cycled once for every 2
hours of required minimum L70 life.
The variation of chromaticity shall be within 0.004 from the weighted average point on the
CIE 1976 (u’, v’) diagram.
Table 3: Energy Star requirements for omnidirectional lamps
The performance system performance requirements for non-standard and omnidirectional lamps, as shown in Tables 3
and 4, are essentially the same. The latter has defined luminous intensity distribution and minimum light output, which
allow the lamps to be compared more readily to the incandescent lamps they replace.
Copyright © 2011-2012 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. 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 a19 Reference Design
Design Goals
To be familiar with the rapidly evolving product space for LED replacement lamps, application engineers at Cree have
built at least a dozen different A19 lamp prototypes. Our team has experimented with a broad selection of XLamp LEDs,
drivers and enclosures. We have developed a few examples as models as being the most cost-effective, for a variety of
reasons. For example:
Constraint
Solution
Maximize driver efficiency
XLamp MX-6S
Minimize LED in bulb BOM
XLamp XP-E HEW
Rationale
High voltage LEDs in series all for moreefficient driver implementations
Extremely high lumen/$ ratio, optimized
for diffused lighting applications
Reduced manufacturing complexity;
The 3 snow cones
Minimize Production and inventory costs
XLamp CXA-2011
simplified inventory
Table 4: A19 design goals and LED solutions
We will explore aspects of each of these designs.
Figure 2: A19 bulbs using a variety of Cree XLamp LEDs
Copyright © 2011-2012 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. 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 a19 Reference Design
The table below summarizes characteristics and goals from several bulb designs we review in this application note. All
these designs use hemispheric distribution and are considered non-standard LED lamps in the Energy Star vernacular.
Characteristic
Unit
40-W-Equivalent
“Value” Bulb
60-W-Equivalent
Performance Bulb
Luminaire Light Output
Lm
450
800
Power
W
<10
<13
Efficacy
Lm/W
>50
Lifetime
Hours
CCT
°K
CRI
65
25,000
3,000
3,000
80
80
Table 5: General A19 system goals
Estimate Efficiencies of the optical, thermal & electrical systems
This section is an estimation exercise and discussion for a variety of LED configurations
using Cree’s Product Characterization Tool or PCT.4 The PCT is tool that models basic LED
and system performance to develop initial approaches for system design.
In all the cases we review here, we are assuming a 15% loss in the diffusing structures of
the LED bulbs. This is a representative loss for the cast-plastic diffusive domes.
For a 40-W-equivalent LED bulb we have set up the PCT to compare system estimation
XLamp MX-6 LED
information for three LEDs, the XLamp MX-6S, MX-6 and XP-E HEW. The settings of the PCT
are to deliver 450 lumens with an 85%-efficient optical system and an 87%-efficient driver
system. We also assume we have a heat sink that allows the system to maintain a 55°
solder-point temperature.
We have configured the PCT display to focus on system-wide information, looking at the
number LEDs required, lumens delivered, system wattage and efficacy.
XLamp XP-E HEW LED
4pct.cree.com
Copyright © 2011-2012 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. 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 a19 Reference Design
Figure 3
Compare:
System:
SYS # LED
SYS W
11 SYS lm tot13
12
SYS lm/W
450
Target Lumens :
85%
LED 1
Current (A)
Model
0.100
0.110
0.120
0.130
0.140
0.150
0.160
0.170
…
0.300
0.350
0.400
0.450
0.500
0.550
0.600
0.650
0.700
Flux
Price
$
-
SYS # LEDSYS lm tot
4
4
4
4
4
3
3
3
#N/A
#N/A
#N/A
#N/A
#N/A
#N/A
#N/A
#N/A
#N/A
#N/A
466
500
532.8
563.2
591.2
463.2
481.8
498.6
#N/A
#N/A
#N/A
#N/A
#N/A
#N/A
#N/A
#N/A
#N/A
#N/A
100.0
Flux
55
Price
Tsp (ºC) 2.0
LED Multiple
SYS W
9.61
10.76
11.91
13.06
14.25
11.55
12.45
13.31
#N/A
#N/A
#N/A
#N/A
#N/A
#N/A
#N/A
#N/A
#N/A
#N/A
Electrical Efficiency:
(0.1A - 0.7A)
2
87%
LED 2
Model
15MX-6S {CW/WW}
Cree XLamp
Q4 [100] 3
Fine
Current Display Range:
15
Optical Efficiency:
x1
LED 3
Model
14 MX-6 {CW/WW}
Cree XLamp
Q3 [93.9] 6
$
1
-
Tsp (ºC) 2.0
LED Multiple
SYS lm/W
SYS # LEDSYS lm tot
48.5
46.5
44.7
43.1
41.5
40.1
38.7
37.5
#N/A
#N/A
#N/A
#N/A
#N/A
#N/A
#N/A
#N/A
#N/A
#N/A
17
16
15
14
13
12
11
11
#N/A
7
6
5
5
5
4
4
4
4
450.5
464
471
473.2
470.6
463.2
451
477.4
#N/A
506.8
497.4
464
512
557.5
481.2
514.4
546
575.6
SYS W
5.47
5.7
5.86
5.95
6.13
6.07
5.94
6.32
#N/A
7.64
7.86
7.7
8.79
10
8.97
9.93
10.94
11.95
93.9
Flux
55
Price
x1
Cree XLamp
21 XP-E HEW {CW/NW/WW}
R2 [114]
$
1
7
-
114.0
Tsp (ºC) 2.0
LED Multiple
SYS lm/W
SYS # LEDSYS lm tot
82.4
81.4
80.4
79.5
76.8
76.3
75.9
75.5
#N/A
66.3
63.3
60.3
58.2
55.8
53.6
51.8
49.9
48.2
17
15
14
13
12
11
11
10
#N/A
6
6
5
5
4
4
4
4
3
477.7
460.5
466.2
466.7
460.8
451
478.5
461
#N/A
464.4
532.2
498
551
481.6
520.8
558.8
594.8
472.2
SYS W
5.28
5.17
5.31
5.23
5.24
5.18
5.56
5.4
#N/A
5.93
6.97
6.72
7.64
6.85
7.63
8.37
9.1
7.41
55
x1
1
SYS lm/W
90.5
89.1
87.8
89.2
87.9
87.1
86.1
85.4
#N/A
78.3
76.4
74.1
72.1
70.3
68.3
66.8
65.4
63.7
Figure 3: Product Characterization Tool analysis of a 450-lumen A19 bulb
This analysis shows us many approaches to delivering a 40-W-equivalent value bulb. In considering drive current and
number of LEDs, at one end of the spectrum the four MX-6S LEDs can present an 85-V, 100-mA load, consume just
under 10 watts of power and deliver just under 50-lm/W efficacy. Six MX-6 LEDs driven at 350 mA deliver over 63 lm/W
while using under 8 watts of power. Four XP-E HEW LEDs, in the R2 flux bin, can deliver equivalent flux at an improved
efficacy of just over 70 lm/W using 6.9 W of power.
The case for using MX-6S LEDs is particularly interesting and not well represented in Figure 3 because the highvoltage LEDs have the potential to allow for higher-efficiency device drivers. In an article in the April 2011 issue of
LEDs Magazine, Matt Reynolds of National Semiconductor shows through a simple and elegant analysis that the use of
high-voltage LEDs allows for lower operating temperatures of supporting driver electronics — capacitors, inductors and
diodes.5 The implication of his analysis includes the potential for drivers that are both more reliable (cooler operating
temperatures for capacitors, for example) and more efficient. In our PCT analysis, an increase of 6% efficiency in drive
electronics, from 87% to 93%, delivers an almost 7% improvement in efficacy.
5
Reynolds, Matthew, “High LED Drive Currents with Low Stack Voltages Creat Efficiency Challenges,” LEDs Magazine, February,
2011, pp 53-59.
Copyright © 2011-2012 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. 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 a19 Reference Design
Figure 4
Compare:
System:
SYS # LED
SYS W
11 SYS lm tot13
12
SYS lm/W
450
Target Lumens :
85%
Optical Efficiency:
LED 1
Current (A)
Model
0.100
0.110
0.120
0.130
0.140
0.150
0.160
0.170
0.180
0.190
0.200
Flux
Price
Q4 [100] 3
-
Tsp (ºC) 2.0
LED Multiple
4
4
4
4
4
3
3
3
#N/A
#N/A
#N/A
466
500
532.8
563.2
591.2
463.2
481.8
498.6
#N/A
#N/A
#N/A
SYS W
8.99
10.06
11.14
12.22
13.33
10.81
11.65
12.45
#N/A
#N/A
#N/A
2
93%
Price
55
x1
LED 3
Model
1
(none)
Flux
100.0
SYS # LEDSYS lm tot
Electrical Efficiency:
(0.1A - 0.7A)
LED 2
Model
15MX-6S {CW/WW}
Cree XLamp
$
Fine
Current Display Range:
15
1
$
1
-
0.0
Tj (ºC) 1.0
LED Multiple
Flux
Price
25
x1
1
(none)
1
$
1
-
0.0
Tj (ºC) 1.0
LED Multiple
25
x1
1
SYS lm/W
51.8
49.7
47.8
46.1
44.4
42.8
41.4
40
#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
#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
#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
#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
Figure 4: Improved driver performance for the MX-6S LED
The choices change when moving to the brighter 60-W-equivalent LED lamp. Very high
efficacies can be achieved with large numbers of LEDs, but it is an impractical amount of
money to be spent on LEDs, and the space constraints of the bulb will not permit it. In
practice, the 800-lumen target is achieved with a few additional parts and with an increased
thermal load in the system. For this part of the exercise, we are assuming a higher junction
temperature of 85 °C. The two cost-effective LEDs for this bulb are the XP-E HEW and
the CXA2011. The PCT is again configured to illustrate numbers of LEDs, system lumens,
system power and efficacy.
XLamp XP-E HEW LED
XLamp CXA2011 LED
Copyright © 2011-2012 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. 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 a19 Reference Design
Figure 5: LED configurations for a 60-W-equivalent, non-directional LED lamp
Running at these space-constrained and elevated temperatures, it takes eight XP-E HEW LEDs from the R2 flux bin,
driven at 350 mA to deliver 810 lumens, at 12 watts of power with an efficacy of almost 68 lm/W. The single CXA2011
from the J flux bin, running at 250 mA delivers improved performance: 814 lumens, 11.3 watts and over 72 lm/W.
Implementations and Analysis
The most thorough analysis of a Cree LED A19 bulb comes from a collaboration with Marvell Semiconductor (www.
marvell.com). The 40-watt-equivalent LED replacement lamp uses four Cree XP-E HEW LEDs and Marvell’s 88EM8081
PFC controller. The system delivers 475 lumens at 3000 °K CCT, consuming 7.5 watts of power.6 This implementation is
in good correspondence with the PCT analysis in Figure 3.
6
Details on this design are available at www.marvell.com/green-technology/Marvell_Cree_A19LED_Reference_Bulb_platform_
brief_PB001.pdf
Copyright © 2011-2012 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. For product specifications, please see the data sheets available at www.cree.com. For warranty information, please contact Cree Sales at [email protected]
10
Figure 6
XLamp a19 Reference Design
Figure 6: 4 XP-E HEW LEDs in a 40-W-equivalent A19 lamp
Figure 7
In early 2011, Cree built a CXA20011-based A19 bulb. In fact, in analyzing some A19 replacement lamps on the market,
we found one with a device driver that closely matched the CXA2011 voltage and current requirements, and as a first
pass replaced the LED array with a CXA2011. Results from this first experiment were somewhat disappointing. At
steady-state, the bulb produced 750 lumens and consumed 12.8 watts with a system efficacy of 58 Lm/W. Although
this level of performance is Energy Star conformant, it was not in good correspondence with the PCT analysis shown in
Figure 5. We believe refinements to the heat sink assembly and a more recent driver circuit could deliver a substantial
improvement in performance.
Figure 7: A19 bulb with a CXA2011 LED
Copyright © 2011-2012 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. 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 a19 Reference Design
Conclusions
Because of their small size and lumen density, development of cost-effective and well-engineered LED replacement
lamps presents tremendous challenges to every aspect of LED systems design. Experimentation and innovation are
occurring throughout the LED replacement lamp ecosystem. Cree supports this ecosystem by delivering the broadest
portfolio of LEDs in the industry and by maintaining a vigorous pace of product innovation to bring the best LED options
to the replacement-lamp manufacturing community.
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 © 2011-2012 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. For product specifications, please see the data sheets available at www.cree.com. For warranty information, please contact Cree Sales at [email protected]
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