Cree XLamp XM-L LED 6-Inch Downlight Reference Design

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ApplicAtion note

.cre e. c O m /Xl A mp C LD -A P 93 r ev 0 C

Cree ^® XLamp ^® XM-L LED

6-Inch Downlight Reference Design

IntRoDuCtIon

This application note details the design of a 6-inch downlight using Cree’s XLamp

^®

XM-L LED, a single die, high-flux component optimized for very high-lumen applications such as indoor commercial, high-bay and roadway lights. The XM-L offers industry-leading performance and reliability.

Six-inch downlights are the industry standard indoors and outdoors in both residential and commercial applications such as soffits and ceilings, where a wide beam pattern is desirable.

Although typical light output ranges from 500 to 2000 lumens, high-ceiling applications require even higher light levels. The high flux and efficacy offered by the XLamp XM-L LED make it a strong candidate for use in such a 6-inch downlight.

Introduction ...1

Design approach/objectives ...2

The 6-step methodology ...2

1. Define lighting requirements ...2

2. Define design goals ...4

3. Estimate efficiencies of the optical, thermal & electrical systems ...4

4. Calculate the number of LeDs ...7

5. Consider all design possibilities ...7

6. Complete the final steps ...8

Conclusion ...14

Bill of materials ...15

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.

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DEsIgn appRoaCh/objECtIvEs

In the “LeD Luminaire Design Guide” Cree advocates a 6-step framework for creating LED luminaires. 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 the design is an LeD-based downlight that shows the performance available from the XLamp XM-L LeD.

1. DEfInE LIghtIng REquIREMEnts

Table 2shows a ranked list of desirable characteristics to address in a downlight reference design.

table 2: some ranked design criteria for an LED downlight

Importance Characteristics units

Critical

Luminous flux (steady-state) lumens (lm)

Efficacy lumens per watt (lm/W)

Luminous distribution Color uniformity Form factor

Important

Price $

Lifetime hours

Operating temperatures °C

Operating humidity % relative humidity

CCT K

CrI 100-point scale

Manufacturability ease of installation

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XLamp

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Xm-L LED 6-inch DownLight REfEREncE DEsign

Table 3 and Table 4 summarize the eNerGY STAr

^®

requirements for luminaires.

¹

table 3: ENERGY STAR luminous efficacy, output and zonal lumen-density requirements

Luminaire Type Luminaire Efficacy (Initial)

EnERgy staR REquIREMEnts Luminaire Minimum Light

Output (Initial) Luminaire Zonal Lumen Density Requirement Downlights:

• recessed

• surface

• pendant

• SSL downlight retrofits

42 lm/W ≤ 4.5” aperture: 345 lumens

> 4.5” aperture: 575 lumens

Luminaire shall deliver a minimum of 75% of total initial lumens within the 0-60° zone (axially symmetric about the nadir)

table 4: ENERGY STAR luminaire 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.

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 TMP_LeD 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 TMP_LeD 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 (non-directional luminaires) shall have one of the following nominal CCTs:

• 2700 Kelvin

• 3000 Kelvin

• 3500 Kelvin

• 4000 Kelvin

• 5000 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 (non-directional 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.

1 ENERGY STAR Program Requirements, Product Specification for Luminaires (Light Fixtures), Eligibility Criteria, Version 1.1

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Characteristic Requirements 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:

Light source shall remain continuously illuminated within one second of application of electrical power.

Source run-up time requirements:

Light source shall reach 90% of stabilized lumen output within one minute of application of electrical power.

Power factor requirements:

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 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:

Frequency ≥ 120 Hz

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.

Noise requirements: directional and

non-directional luminaires All ballasts & drivers used within the luminaire shall have a Class A sound rating.

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.

electromagnetic and radio frequency interference requirements:

Power supplies and/or drivers shall meet FCC requirements:

• Class A for power supplies or drivers that are marketed for use in a commercial, industrial or business environment, exclusive of a device which is marketed for use by the general public or is intended to be used in the home.

• Class B for power supplies or drivers that are marketed for use in a residential environment notwithstanding use in commercial, business and industrial environments.

2. DEfInE DEsIgn goaLs

Table 5 shows the design goals for this project.

table 5: Design goals

Characteristic unit Minimum goal target goal

Light output lm 3000 > 3000

Power W 50 < 50

Luminaire efficacy lm/W 60 65

Lifetime hours 50,000 50,000

CCT K 3000 3000

CrI 100-point scale 80 > 80

Power factor % 90 > 90

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.

For the 3000-lumen target, we estimated 92% optical efficiency and 85% driver efficiency. We also estimated a solder point temperature

of 55 °C.

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XLamp

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Xm-L LED 6-inch DownLight REfEREncE DEsign

figure 1: pCt view of the number of LEDs used and driving current

The PCT shows that, at 1.7 A, 8 XM-L LEDs provide sufficient light output to meet the design goals.

Thermal Requirements

For the 6-inch downlight in this reference design, we decided to use a commercially available housing, shown in Figure 2. We also decided to use a commercially available heat sink, shown in Figure 3, attached to the back of the housing to dissipate the thermal load.

1

LED System Comparison Report

System: 3,000 90% 85%

Model Model Model

Flux

^{T3 [220]}

Tsp (ºC)

⁵⁵

Flux Tj (ºC)

²⁵

Flux Tj (ºC)

²⁵

Price

$ ^-

Price

$ ^-

Price

$ ^-

SYS lm tot

SYS # LED SYS lm/W SYS W

0.350 3032.2 32 86.2 35.17 #N/A #N/A #N/A #N/A #N/A #N/A #N/A #N/A

0.400 3018.7 28 85.2 35.42 #N/A #N/A #N/A #N/A #N/A #N/A #N/A #N/A

0.450 3017.4 25 84.2 35.82 #N/A #N/A #N/A #N/A #N/A #N/A #N/A #N/A

0.500 3069.4 23 83.2 36.87 #N/A #N/A #N/A #N/A #N/A #N/A #N/A #N/A

0.550 3066.3 21 82.3 37.27 #N/A #N/A #N/A #N/A #N/A #N/A #N/A #N/A

0.600 3009.8 19 81.3 37.03 #N/A #N/A #N/A #N/A #N/A #N/A #N/A #N/A

0.650 3071.5 18 80.3 38.24 #N/A #N/A #N/A #N/A #N/A #N/A #N/A #N/A

0.700 3106.1 17 79.4 39.13 #N/A #N/A #N/A #N/A #N/A #N/A #N/A #N/A

0.750 3113.9 16 78.5 39.69 #N/A #N/A #N/A #N/A #N/A #N/A #N/A #N/A

0.800 3095.4 15 77.6 39.91 #N/A #N/A #N/A #N/A #N/A #N/A #N/A #N/A

0.850 3051.2 14 76.7 39.8 #N/A #N/A #N/A #N/A #N/A #N/A #N/A #N/A

0.900 3211 14 75.8 42.37 #N/A #N/A #N/A #N/A #N/A #N/A #N/A #N/A

0.950 3128 13 74.9 41.75 #N/A #N/A #N/A #N/A #N/A #N/A #N/A #N/A

1.000 3020.6 12 74.1 40.77 #N/A #N/A #N/A #N/A #N/A #N/A #N/A #N/A

1.100 3007.7 11 72.5 41.51 #N/A #N/A #N/A #N/A #N/A #N/A #N/A #N/A

1.200 3238.7 11 70.9 45.7 #N/A #N/A #N/A #N/A #N/A #N/A #N/A #N/A

1.300 3148.6 10 69.4 45.39 #N/A #N/A #N/A #N/A #N/A #N/A #N/A #N/A

1.400 3011.2 9 67.9 44.34 #N/A #N/A #N/A #N/A #N/A #N/A #N/A #N/A

1.500 3182.9 9 66.5 47.86 #N/A #N/A #N/A #N/A #N/A #N/A #N/A #N/A

1.600 3349.7 9 65.2 51.41 #N/A #N/A #N/A #N/A #N/A #N/A #N/A #N/A

1.700 3120 8 63.9 48.86 #N/A #N/A #N/A #N/A #N/A #N/A #N/A #N/A

1.800 3257.5 8 62.6 52.03 #N/A #N/A #N/A #N/A #N/A #N/A #N/A #N/A

1.900 3390 8 61.4 55.21 #N/A #N/A #N/A #N/A #N/A #N/A #N/A #N/A

2.000 3077.8 7 60.2 51.1 #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 sheets available at www.cree.com.

Cree XLamp XM-L {CW/NW/WW} (none) (none)

Target Lumens : Optical Efficiency: Electrical Efficiency:

Current (A)

LED 1 LED 2 LED 3

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We performed thermal simulations to verify this thermal design is sufficient. Figure 4 shows the thermal simulation results for the design.

The simulated solder point temperature (T

_SP

) was determined to be 51 °C.

figure 4: thermal simulation of XM-L downlight

Driver

The driver for this 6-inch downlight can be mounted separate from the downlight and there is no driver size limit. This reference design does not require a custom driver and we decided to use a constant-current off-the-shelf driver.

figure 5: Driver

figure 2: housing Figure 4 figure 3: heat sink

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XLamp

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Xm-L LED 6-inch DownLight REfEREncE DEsign

Secondary Optics

A diffuser is commonly used in downlight designs to minimize glare and hot spots and to distribute light evenly. This downlight design uses a diffuser and a reflector to maximize light output. These two optical elements are contained in the housing.

The reflector efficiency is ~99% and the diffuser efficiency is ~89%, giving a total optical efficiency of ~90%.

4. CaLCuLatE thE nuMbER of LEDs

Using Cree’s PCT, we determined that 8 XLamp XM-L LEDs produce sufficient light to meet the 3000-lm design goal.

5. ConsIDER aLL DEsIgn possIbILItIEs

There are many ways to design an LeD-based downlight. This reference design aims to show that a small number of XM-L LeDs enable a downlight offering superior performance.

The XM-L LeD offers a wide range of color temperatures. As highlighted in Table 6, we selected a warm white LeD for this downlight design. By selecting an LED from a low-level flux bin, we ensured that this design meets its goals using an LED that is readily available.

table 6: XM-L order codes

Color CCt Range base order Codes

min. Luminous flux @ 700 mA (lm) order Code

Min. Max. group flux (lm)

Cool White 5,000 K 8,300 K T5 260 XMLAWT-00-0000-0000T5051

T6 280 XMLAWT-00-0000-0000T6051

Neutral White 3,700 K 5,000 K T4 240 XMLAWT-00-0000-000LT40e4

T5 260 XMLAWT-00-0000-000LT50F4

80-CrI White 2,600 K 4,300 K T2 200 XMLAWT-00-0000-000HT20E7

T3 220 XMLAWT-00-0000-000HT30F7

Warm White 2,600 K 3,700 K T2 200 XMLAWT-00-0000-000LT20e7

T3 220 XMLAWT-00-0000-000LT30F7

figure 6: Diffuser lens figure 7: Reflector

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6. CoMpLEtE thE fInaL stEps

Using the methodology described above, we determined a suitable combination of LeDs, components and drive conditions. This section describes how Cree assembled the downlight and shows the results of the design.

prototyping Details

1. We verified the component dimensions to ensure a correct fit.

2. Following the recommendations in Cree’s Soldering and Handling Application Note for the XM-L LED with an appropriate solder paste and reflow profile, we reflow soldered the LEDs to the metal core printed circuit board (MCPCB).

3. We soldered the input wires to the MCPCB.

4. We tested the connection by applying power to the LEDs and verified the LEDs lit up.

5. We applied a thin layer of thermal conductive compound to the back of MCPCB and attached it to the heat sink.

6. We attached a round white reflector (with cutout openings matching the LEDs) to the MCPCB,

securing it with screws.

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XLamp

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Xm-L LED 6-inch DownLight REfEREncE DEsign

7. We attached the housing to the heat sink with screws.

8. We attached the reflector to the bottom of the housing with screws. We attached the reflector to the sides of the housing with double-sided tape.

9. We fit the diffuser lens into the housing and secured it with the diffuser cover trim.

10. We connected the LeD DC input wires to the driver DC output wires with connectors.

11. We performed final testing.

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Results

Thermal Results

Cree verified the board temperature with a thermocouple and an infrared (IR) thermal imaging camera to confirm that the thermal dissipation performance of the heat sink aligns with our simulations. As shown in Figure 8, the measured solder point temperature was 53 °C, which is in close agreement with the simulation and shows that the heat sink is sufficient for this design.

Based on the measured solder point temperature of 53 °C, the junction temperature (T

_J

) can be calculated as follows:

T

_J

= T

_SP

+ (LED power * LED thermal resistance) T

_J

= 53 °C + (5.3 W * 2.5 °C/W)

T

_J

= 66 °C

Estimated LED Lifetime

We used Cree’s TM-21 Calculator Tool to project the lifetime of the XM-L LeD used in this downlight. Figure 9 shows the calculated and reported lifetimes, determined using the TM-21 projection algorithm, for the XM-L LeD at a 2-A input current at three solder point temperatures. The duration of Cree’s XM-L LM-80 data set is 6000 hours at a 2-A drive current. Because the TM-21 methodology limits the projection to six times the duration of the LM-80 data set, our TM-21 calculation shows a lifetime L70(6k) projection of greater than 36,300 hours. We are confident that most drivers can meet this temperature/lifetime requirement as well.

figure 8: thermal results

for XM-L downlight

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XLamp

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Xm-L LED 6-inch DownLight REfEREncE DEsign

figure 9: XM-L tM-21 data

Figure 10 shows the calculated and reported lifetimes for the XM-L LeD, interpolated from the data shown in Figure 9, at a measured 53 °C T

_SP

. With a reported L70(6k) lifetime greater than 36,300 hours, we expect the lamp to easily meet the design’s lifetime requirement.

LED I

Data Set 1 2 3

Tsp 45°C 55°C 85°C

Sample Size 25 25 25

Test Duration 6,048 hrs 6,048 hrs 6,048 hrs

α 1.459E-07 9.543E-07 2.155E-06

β 9.847E-01 9.887E-01 9.834E-01

Calculated Lifetime L70(6k) = 2,340,000 hours L70(6k) = 362,000 hours L70(6k) = 158,000 hours Reported Lifetime L70(6k) > 36,300 hours L70(6k) > 36,300 hours L70(6k) > 36,300 hours

Reported L70 Calculated Lifetime Reported Lifetime XLamp XM-L White

2000 mA

TM-21 Lifetime Report

50 55 60 65 70 75 80 85 90 95 100 105 110

1,000 10,000 100,000 1,000,000 10,000,000

% Lu m in ou s Fl ux

Time (hours)

45°C (LM-80)

55°C (LM-80)

85°C (LM-80)

45°C (TM-21)

55°C (TM-21)

85°C (TM-21)

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figure 10: XM-L tM-21 data with t

_sp

= 53 °c

Optical and Electrical Results

We obtained the results in Table 7 by testing the downlight in a 2-meter sphere after a 30-minute stabilization time.

²

As the table shows, the downlight meets the target goals of 3000 lm using less than 50 W of power. The downlight also meets the ENERGY STAR efficacy, power factor, CCT and CrI requirements.

LED I

Ts1 Tsi (Interpolated) Ts2

Tsp 45°C 53°C 55°C

Tsp 318.15 K 326.15 K 328.15 K

Ea/kB A

α 1.459E-07 6.616E-07 9.543E-07

β ^9.847E-01 ^9.867E-01 ^9.887E-01

Calculated L70 L70(6k) = 2,340,000 hours L70(6k) = 519,000 hours L70(6k) = 362,000 hours Reported L70 L70(6k) > 36,300 hours L70(6k) > 36,300 hours L70(6k) > 36,300 hours

Calculated Lifetime L70(6k) = 519,000 hours

Reported Lifetime L70(6k) > 36,300 hours

19608.38 8.5246E+19 XLamp XM-L White

2000 mA

L70: 519, 000hrs

50 55 60 65 70 75 80 85 90 95 100 105 110

1,000 10,000 100,000 1,000,000 10,000,000

% Lu m in ou s Fl ux

Time (hours)

45°C (LM-80)

55°C (LM-80)

85°C (LM-80)

45°C (TM-21)

55°C (TM-21)

85°C (TM-21)

53°C (TM-21)

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XLamp

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Xm-L LED 6-inch DownLight REfEREncE DEsign

table 7: Xm-L downlight steady-state results

Characteristic unit XM-L Downlight

Light output (30 min on-time) lm 3106

Power W 47.2

Luminaire effic acy lm/W 65.9

CCT K 3093

CrI 100-point scale 82

Power factor % 99.2

We also tested the intensity distribution of the downlight.

³

Figure 11 shows an even intensity distribution for the downlight with an 86°

beam angle.

figure 11: Angular luminous intensity distribution of Xm-L downlight Table 8 shows the illuminance of the XM-L downlight at various distances from the light source.

3 Testing was performed in a type A goniometer at the Cree facilities in Shenzhen, China. An IES file for the downlight is available.

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table 8: Xm-L downlight illuminance – 86° beam angle

height Illuminance Diameter

1 m 3.3 ft 125.4 fc 1349.8 lx 185.6 cm 6.1 ft

2 m 6.6 ft 31.4 fc 337.5 lx 371.3 cm 12.2 ft

3 m 9.8 ft 13.9 fc 150.0 lx 556.9 cm 18.3 ft

4 m 13.1 ft 7.8 fc 84.4 lx 742.5 cm 24.4 ft

5 m 16.4 ft 5.0 fc 54.0 lx 928.1 cm 30.5 ft

6 m 19.7 ft 3.5 fc 37.5 lx 1113.7 cm 36.5 ft

7 m 23.0 ft 2.6 fc 27.6 lx 1299.4 cm 42.6 ft

8 m 26.2 ft 2.0 fc 21.1 lx 1485.0 cm 48.7 ft

9 m 29.5 ft 1.6 fc 16.7 lx 1670.6 cm 54.8 ft

10 m 32.8 ft 1.3 fc 13.5 lx 1856.2 cm 60.9 ft

ConCLusIon

This reference design illustrates the excellent results obtainable from a 6-inch downlight based on the Cree XLamp XM-L LED. The high flux

output of the XM-L LED enabled these results with a small number of LEDs, keeping system costs low. The directionality of the XM-L LED

is a plus in a downlight, putting more light on the surface to be illuminated. The downlight components in this design are all commercially

available, showing that an extremely capable luminaire can be designed without the time and expense of developing custom parts. The

lighting-class performance of the Cree XLamp XM-L LED makes it an attractive design option for an LED-based 6-inch downlight.

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XLamp

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Xm-L LED 6-inch DownLight REfEREncE DEsign

bILL of MatERIaLs

table 9: bill of materials for XM-L downlight

Component order Code/Model number company Web Link

Diffuser C3-85 Bright view Technologies www.brightviewtechnologies.com

Driver eUC-060S170ST Inventronics www.inventronics-co.com

Heat sink 437 Foshan Xin Yi Kangke Metal Product

Co. Ltd. www.fsxykk.com/EN/Default.asp

Housing XN-8012 Xuning Hardware Plastic Products Co.,

Ltd. www.hzsxn.diytrade.com

LeD Cree, Inc. XM-L product page

Reflector Flying Technology Co. www.flyingtechnology.com

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.

Cree XLamp XM-L LED 6-Inch Downlight Reference Design

ApplicAtion note

.cre e. c O m /Xl A mp C LD -A P 93 r ev 0 C