bl-lm80-vero 29-01 9000 hours (shenglu) -...

Bridgelux Reliability Report Number: BL-LM80-Vero 29-02

--------------------------------------------------------------------------------------------------------------------- Confidential of 15 November 21, 2013 Bridgelux Inc. ISO17025 Registered http://www.Bridgelux.com 101 Portola Avenue, Livermore, CA 94551 PH: (925)583-8400

November 21, 2013

Bridgelux LM80 Report: 9,000 Hour Test Data

Bridgelux Vero 29 LED Array: BXRC-30E10K0 Contents:

Number of LED light Sources tested .................................................... 2

Description of LED light sources ......................................................... 2

Description of Auxiliary Equipment ...................................................... 3

Operating Cycle ............................................................................ 4

Test Condition ............................................................................ 4

Ambient Conditions ........................................................................ 4

Airflow ..................................................................................... 4

Physical condition of parts at read-points ............................................ 4

Case Temperature (Test Point Temperature) .......................................... 4

Drive Current ................................................................................ 4

Initial Flux and Forward Voltage at Photometric Measurement Current ............ 5

Lumen Maintenance ....................................................................... 6

Observation of Failures .................................................................... 9

LED Light Source monitoring interval ................................................... 9

Photometric Measurement Uncertainty ................................................. 9

Gauge study results ..................................................................... 9

Chromaticity Shift ......................................................................... 10



Number of LED light sources tested 10 arrays tested at actual case temperature 55ºC (nominal 55ºC) 10 arrays tested at actual case temperature 85ºC (nominal 85ºC) 10 arrays tested at actual case temperature 105ºC (nominal 105ºC)

Samples have been selected to be representative of the overall population being tested. AQL “Zero Based Acceptance Sampling Plan” has been used to pick samples from a typical lot size of 250 units. The AQL level is 4%.

Description of LED light sources Bridgelux Vero LED array: BXRC-30E10K0

Color Temperature: 3000K

This report also covers the following products:

Vero 29

All products are with prefix BXRC-

Warm White: 2700K, 3000K, 3500K 27E10K0, 30E10K0, 27G10K0, 30G10K0, 35E10K0 Neutral White: 4000K 40E10K0 Cool White: 5000K 50C10K0



Description of Auxiliary Equipment Tester: Automatic LED array tester Temperature controlled systems to create the necessary test conditions Arrays driven using constant current driver

Array tester: The tester is capable of testing an entire board with up to 12 samples. The tester consists of a spectrometer, handler, power supplies and a computer. Sample preparation: Devices under Test (DUT) are soldered to PCBs which are mounted on metallic plates. These plates are mounted on heat sinks to maintain the test temperatures required by LM80 test procedure. All necessary steps are taken to ensure the uniformity of temperature and environmental conditions to meet LM80 test criteria.



Operating Cycle

Test Condition Number of units: 10 at 55ºC, 10 at 85ºC and 10 at 105ºC. Drive current: 3150mA constant current, per array Typical Voltage: 41.5V

Ambient Conditions Summary of temperature and humidity conditions: Table 1: Test Environment

Surrounding Temperature

Actual Case Temperature

Nominal Case Temperature

Relative Humidity

53ºC 55ºC 55ºC <60% 83ºC 85ºC 85ºC <60% 103ºC 105ºC 105ºC <60%

Airflow Note: Airflow is kept to minimum required to maintain the required temperature uniformity as defined in the LM80 requirements document. The temperature of the air surrounding DUTs is controlled to be less than 5ºC below the case temperature as required by LM80 specification.

Physical condition of parts at read-points No cracks No discoloration No electrical discontinuity

Case Temperature (Test Point Temperature) Refer to Table 1 (Test Environment)

Drive Current A drive current of 262.5mA per diode was used during lifetime test.



Table 2: Initial Flux and Forward Voltage at Photometric Measurement Current Ambient temperature during lumen and chromaticity measurements was maintained at 25ºC ±2ºC First set (samples tested at actual case temperature 55ºC)

Sample 1 Sample 2 Sample 3 Sample 4 Sample 5 Sample 6 Sample 7 Sample 8 Sample 9 Sample 10 Average MedianStandard Deviation

Max Min

Initial Flux 11077.77 11058.61 11155.92 10803.50 11160.68 11364.28 11268.93 10637.38 10919.67 10618.00 11006.47 11068.19 255.32 11364.28 10618.00

Forward Voltage

41.42 41.64 41.61 41.37 41.72 41.47 41.53 41.44 41.27 41.35 41.48 41.46 0.14 41.72 41.27

CCT,K 3102.54 3113.21 3110.07 3186.44 3135.12 3131.25 3150.98 3171.76 3073.55 3177.31 3135.22 3133.19 36.49 3186.44 3073.55 Second set (samples tested at actual case temperature 85ºC)

Sample 1 Sample 2 Sample 3 Sample 4 Sample 5 Sample 6 Sample 7 Sample 8 Sample 9 Sample 10 Average MedianStandard Deviation

Max Min

Initial Flux 11425.89 10928.74 10742.87 11500.28 11201.82 11228.95 10822.17 11332.53 10594.22 10722.83 11050.03 11065.28 325.69 11500.28 10594.22

Forward Voltage

41.29 41.44 41.66 41.11 41.14 41.00 41.27 41.42 41.19 41.32 41.28 41.28 0.19 41.66 41.00

CCT,K 3094.92 3138.73 3157.10 3154.90 3123.97 3138.22 3139.29 3116.00 3112.64 3112.28 3128.81 3131.10 20.13 3157.10 3094.92

Third set (samples tested at actual case temperature 105ºC)

Sample 1 Sample 2 Sample 3 Sample 4 Sample 5 Sample 6 Sample 7 Sample 8 Sample 9 Sample 10 Average Median

Standard Deviation

Max Min

Initial Flux 11071.77 11204.08 11224.02 11015.50 11538.85 11404.17 11509.25 11343.61 11221.56 11145.08 11267.79 11222.79 176.81 11538.85 11015.50

Forward Voltage

41.05 42.07 42.00 41.57 41.18 41.07 41.06 41.17 41.52 41.23 41.39 41.20 0.38 42.07 41.05

CCT,K 3125.59 3133.57 3150.93 3131.66 3143.05 3145.97 3135.46 3146.54 3161.90 3167.61 3144.23 3144.51 13.37 3167.61 3125.59



Lumen Maintenance Ambient temperature during lumen measurements was maintained at 25ºC ±2ºC Table 3: Lumen Maintenance at actual case temperature 55ºC

Hours Sample 1 Sample 2 Sample 3 Sample 4 Sample 5 Sample 6 Sample 7 Sample 8 Sample 9 Sample 10 Average MedianStandard Deviation

Max Min

0 100.00% 100.00% 100.00% 100.00% 100.00% 100.00% 100.00% 100.00% 100.00% 100.00% 100.00% 100.00% 0.00% 100.00% 100.00%

1003 100.98% 100.60% 100.80% 102.03% 101.14% 100.73% 101.00% 102.17% 100.98% 102.31% 101.27% 100.99% 0.64% 102.31% 100.60%

2000 100.08% 99.71% 99.83% 100.61% 100.35% 99.61% 99.90% 100.74% 99.99% 100.80% 100.16% 100.04% 0.44% 100.80% 99.61%

3000 99.97% 99.73% 99.44% 100.29% 100.42% 99.58% 99.80% 100.46% 99.84% 100.50% 100.00% 99.91% 0.39% 100.50% 99.44%

4000 99.43% 99.27% 98.84% 99.59% 99.97% 99.25% 99.24% 99.84% 99.42% 99.79% 99.46% 99.42% 0.34% 99.97% 98.84%

5000 99.49% 99.45% 98.96% 99.62% 100.27% 99.55% 99.54% 99.85% 99.77% 99.96% 99.65% 99.58% 0.35% 100.27% 98.96%

6000 98.70% 98.60% 98.09% 98.67% 99.45% 98.75% 98.68% 98.89% 99.01% 99.16% 98.80% 98.72% 0.36% 99.45% 98.09%

7000 99.40% 99.23% 98.47% 98.81% 99.83% 98.99% 98.78% 98.98% 99.09% 99.07% 99.06% 99.03% 0.37% 99.83% 98.47%

8000 98.86% 98.70% 97.89% 98.22% 99.53% 98.39% 98.33% 98.45% 98.55% 98.41% 98.53% 98.43% 0.44% 99.53% 97.89%

9000 98.14% 98.17% 97.27% 97.59% 99.03% 97.99% 97.81% 97.85% 98.07% 97.80% 97.97% 97.92% 0.46% 99.03% 97.27% Figure 1: Lumen Maintenance at actual case temperature 55ºC



Table 4: Lumen Maintenance at actual case temperature 85ºC

Hours Sample 1 Sample 2 Sample 3 Sample 4 Sample 5 Sample 6 Sample 7 Sample 8 Sample 9 Sample 10 Average MedianStandard Deviation

Max Min

0 100.00% 100.00% 100.00% 100.00% 100.00% 100.00% 100.00% 100.00% 100.00% 100.00% 100.00% 100.00% 0.00% 100.00% 100.00%

1000 99.81% 99.88% 99.14% 100.07% 99.08% 99.01% 99.22% 98.72% 99.39% 99.40% 99.37% 99.30% 0.43% 100.07% 98.72%

2000 97.89% 98.04% 97.74% 98.23% 97.67% 97.85% 97.71% 96.75% 97.99% 98.58% 97.85% 97.87% 0.47% 98.58% 96.75%

3000 96.98% 96.62% 96.73% 96.76% 96.36% 96.89% 96.43% 95.35% 96.27% 97.41% 96.58% 96.67% 0.55% 97.41% 95.35%

4000 95.73% 95.43% 95.53% 95.53% 95.63% 95.72% 95.84% 94.55% 95.04% 96.11% 95.51% 95.58% 0.44% 96.11% 94.55%

5000 94.16% 93.92% 94.33% 94.16% 94.40% 94.65% 95.05% 94.03% 94.25% 95.21% 94.42% 94.29% 0.43% 95.21% 93.92%

6000 94.54% 94.40% 94.62% 94.24% 94.88% 94.66% 95.40% 94.13% 94.17% 94.79% 94.58% 94.58% 0.39% 95.40% 94.13%

7000 94.02% 93.85% 94.04% 93.87% 94.40% 94.20% 94.86% 93.58% 93.60% 93.75% 94.02% 93.94% 0.39% 94.86% 93.58%

8000 92.22% 92.29% 93.18% 92.79% 93.19% 92.85% 93.77% 92.85% 93.17% 92.98% 92.93% 92.92% 0.45% 93.77% 92.22%

9000 91.41% 91.41% 93.40% 92.95% 92.36% 92.63% 93.00% 92.44% 92.87% 92.68% 92.51% 92.66% 0.65% 93.40% 91.41% Figure 2: Lumen Maintenance at actual case temperature 85ºC



Table 5: Lumen Maintenance at actual case temperature 105ºC

Hours Sample 1 Sample 2 Sample 3 Sample 4 Sample 5 Sample 6 Sample 7 Sample 8 Sample 9 Sample 10 Average Median

Standard Deviation

Max Min

0 100.00% 100.00% 100.00% 100.00% 100.00% 100.00% 100.00% 100.00% 100.00% 100.00% 100.00% 100.00% 0.00% 100.00% 100.00%

1000 97.01% 97.86% 97.65% 98.82% 98.09% 98.20% 98.86% 96.55% 97.79% 96.52% 97.73% 97.82% 0.83% 98.86% 96.52%

2000 93.83% 94.96% 94.42% 96.25% 94.87% 95.03% 96.18% 92.31% 95.24% 92.82% 94.59% 94.92% 1.29% 96.25% 92.31%

3000 92.31% 94.08% 93.27% 95.46% 93.86% 93.64% 95.07% 90.32% 92.28% 90.17% 93.05% 93.46% 1.79% 95.46% 90.17%

4000 90.88% 92.85% 91.74% 93.89% 92.38% 91.91% 93.34% 89.98% 91.71% 89.86% 91.85% 91.82% 1.34% 93.89% 89.86%

5000 91.11% 93.34% 92.14% 93.67% 92.33% 91.79% 93.05% 91.08% 91.93% 90.62% 92.10% 92.04% 1.02% 93.67% 90.62%

6000 91.66% 93.98% 92.56% 93.88% 92.90% 91.96% 93.08% 91.12% 91.60% 90.98% 92.37% 92.26% 1.08% 93.98% 90.98%

7000 90.45% 92.49% 90.83% 92.14% 91.41% 90.44% 91.09% 89.61% 89.67% 89.60% 90.77% 90.64% 1.03% 92.49% 89.60%

8000 90.49% 92.22% 90.26% 91.95% 91.43% 90.33% 90.67% 89.76% 89.20% 89.55% 90.59% 90.41% 1.01% 92.22% 89.20%

9000 90.75% 92.16% 89.91% 91.75% 91.73% 90.60% 90.24% 85.39% 87.13% 85.60% 89.53% 90.42% 2.55% 92.16% 85.39% Figure 3 Lumen Maintenance at actual case temperature 105ºC



Observation of Failures No optical, electrical or mechanical failure of any LED array was seen during the lifetime testing.

LED Light Source monitoring interval Measurements have been taken after the following durations: Tc = 55ºC: 0, 1000, 2000, 3000, 4000, 5000, 6000, 7000, 8000 and 9000 hours Tc = 85ºC: 0, 1000, 2000, 3000, 4000, 5000, 6000, 7000, 8000 and 9000 hours Tc = 105ºC: 0, 1000, 2000, 3000, 4000, 5000, 6000, 7000, 8000 and 9000 hours

Photometric Measurement Uncertainty The testers are calibrated annually and the calibration data ensures <1.2% uncertainty of measurement.

Gauge Study Results Gauge study shows the following results:

R&R: 0.15% (5.15-sigma) Standard Deviation: 0.03%



Chromaticity Shift Ambient temperature during chromaticity measurements was maintained at 25ºC ±2ºC Table 6: Chromaticity shift (Delta u’v’) at actual case temperature 55ºC

Hours sample1 sample2 sample3 sample4 sample5 sample6 sample7 sample8 sample9 sample10 Average Median

Standard Deviation

Max Min

0 0.0000 0.0013 0.0015 0.0016 0.0020 0.0024 0.0025 0.0025 0.0024 0.0024 0.0019 0.0022 0.0008 0.0025 0.0000

1003 0.0000 0.0013 0.0014 0.0015 0.0018 0.0022 0.0024 0.0023 0.0021 0.0021 0.0017 0.0019 0.0007 0.0024 0.0000

2000 0.0000 0.0010 0.0011 0.0011 0.0016 0.0020 0.0021 0.0019 0.0016 0.0017 0.0014 0.0016 0.0006 0.0021 0.0000

3000 0.0000 0.0009 0.0010 0.0012 0.0016 0.0020 0.0023 0.0023 0.0023 0.0022 0.0016 0.0018 0.0008 0.0023 0.0000

4000 0.0000 0.0006 0.0008 0.0008 0.0012 0.0015 0.0015 0.0016 0.0014 0.0013 0.0011 0.0012 0.0005 0.0016 0.0000

5000 0.0000 0.0012 0.0013 0.0013 0.0017 0.0020 0.0020 0.0019 0.0017 0.0016 0.0015 0.0016 0.0006 0.0020 0.0000

6000 0.0000 0.0007 0.0010 0.0013 0.0016 0.0021 0.0022 0.0022 0.0022 0.0021 0.0016 0.0019 0.0008 0.0022 0.0000

7000 0.0000 0.0010 0.0012 0.0014 0.0018 0.0022 0.0023 0.0022 0.0022 0.0023 0.0017 0.0020 0.0008 0.0023 0.0000

8000 0.0000 0.0014 0.0015 0.0015 0.0020 0.0023 0.0024 0.0023 0.0022 0.0020 0.0018 0.0020 0.0007 0.0024 0.0000

9000 0.0000 0.0013 0.0015 0.0016 0.0021 0.0025 0.0026 0.0026 0.0027 0.0025 0.0019 0.0023 0.0009 0.0027 0.0000 Figure 4: Chromaticity shift (Delta u’v’) at actual case temperature 55ºC



Table 7: Chromaticity Shift (Delta u’v’) at actual case temperature 85ºC

Hours sample1 sample2 sample3 sample4 sample5 sample6 sample7 sample8 sample9 sample10 Average Median

Standard Deviation

Max Min

0 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000

1016 0.0014 0.0014 0.0010 0.0008 0.0013 0.0011 0.0015 0.0011 0.0009 0.0013 0.0012 0.0012 0.0002 0.0015 0.0008

2000 0.0012 0.0014 0.0010 0.0008 0.0013 0.0009 0.0014 0.0011 0.0009 0.0012 0.0011 0.0011 0.0002 0.0014 0.0008

3000 0.0014 0.0017 0.0011 0.0010 0.0015 0.0013 0.0017 0.0011 0.0014 0.0015 0.0014 0.0014 0.0003 0.0017 0.0010

4000 0.0016 0.0019 0.0012 0.0013 0.0017 0.0012 0.0020 0.0014 0.0015 0.0015 0.0015 0.0015 0.0003 0.0020 0.0012

5000 0.0021 0.0023 0.0017 0.0019 0.0021 0.0018 0.0024 0.0014 0.0021 0.0017 0.0020 0.0020 0.0003 0.0024 0.0014

6000 0.0019 0.0024 0.0018 0.0022 0.0022 0.0020 0.0024 0.0016 0.0022 0.0018 0.0020 0.0021 0.0003 0.0024 0.0016

7000 0.0018 0.0022 0.0015 0.0019 0.0019 0.0017 0.0021 0.0015 0.0021 0.0017 0.0019 0.0019 0.0002 0.0022 0.0015

8000 0.0021 0.0024 0.0024 0.0028 0.0022 0.0021 0.0022 0.0018 0.0025 0.0022 0.0023 0.0022 0.0003 0.0028 0.0018

9000 0.0026 0.0028 0.0030 0.0036 0.0024 0.0027 0.0025 0.0020 0.0028 0.0024 0.0027 0.0026 0.0004 0.0036 0.0020 Figure 5: Chromaticity Shift (Delta u’v’) at actual case temperature 85ºC



Table 8: Chromaticity Shift (Delta u’v’) at actual case temperature 105ºC

Hours sample1 sample2 sample3 sample4 sample5 sample6 sample7 sample8 sample9 sample10 Average MedianStandard Deviation

Max Min

0 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000

1000 0.0007 0.0003 0.0005 0.0003 0.0003 0.0005 0.0004 0.0002 0.0002 0.0002 0.0004 0.0003 0.0002 0.0007 0.0002

2000 0.0013 0.0008 0.0011 0.0007 0.0009 0.0009 0.0009 0.0009 0.0007 0.0009 0.0009 0.0009 0.0002 0.0013 0.0007

3000 0.0015 0.0009 0.0012 0.0009 0.0011 0.0012 0.0009 0.0018 0.0015 0.0019 0.0013 0.0012 0.0003 0.0019 0.0009

4000 0.0025 0.0017 0.0022 0.0015 0.0019 0.0020 0.0017 0.0027 0.0021 0.0025 0.0021 0.0021 0.0004 0.0027 0.0015

5000 0.0031 0.0023 0.0028 0.0020 0.0022 0.0026 0.0020 0.0035 0.0024 0.0031 0.0026 0.0025 0.0005 0.0035 0.0020

6000 0.0034 0.0027 0.0032 0.0022 0.0027 0.0028 0.0024 0.0039 0.0026 0.0036 0.0030 0.0028 0.0006 0.0039 0.0022

7000 0.0038 0.0029 0.0035 0.0022 0.0027 0.0032 0.0024 0.0048 0.0031 0.0046 0.0033 0.0031 0.0009 0.0048 0.0022

8000 0.0045 0.0034 0.0040 0.0026 0.0033 0.0039 0.0030 0.0055 0.0035 0.0052 0.0039 0.0037 0.0009 0.0055 0.0026

9000 0.0050 0.0038 0.0045 0.0029 0.0040 0.0046 0.0035 0.0041 0.0035 0.0042 0.0040 0.0041 0.0006 0.0050 0.0029 Figure 6: Chromaticity shift (Delta u’v’) at actual case temperature 105ºC



Figure 7: Drawing for Vero 29 Arrays

Equipment List: 1) Description: DC Power supply Manufacturer: Vektrex Model: SS200 Last Calibration Date: 08/07/13 Next Calibration Due Date: 08/07/14 2) Description: Source meter Manufacturer: Keithly Model: 2410 Last Calibration Date: 09/23/13 Next Calibration Due Date: 09/23/14



3) Description: Thermometer Manufacturer: Omega Model: HH501HT

Last Calibration Date: 09/23/13 Next Calibration Due Date: 09/23/14 4) Description: Thermometer Manufacturer: Pico Model: TC08

Last Calibration Date: 09/23/13 Next Calibration Due Date: 09/23/14 5) Description: Digital Multimeter Manufacturer: Fluke Model: 179

Last Calibration Date: 09/23/13 Next Calibration Due Date: 09/23/14 6) Description: Temp Hum CO2 monitor Manufacturer: Rotronic

Model: HP22

Last Calibration Date: 09/23/13 Next Calibration Due Date: 09/23/14



Prepared By /Date: Verified by:

Farid Ahmed/11-22-13 Phil Elizondo /11-22-13 Reliability Development Engineer Director, Reliability

bl-lm80-vero 29-01 9000 hours (shenglu) -...

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