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Bridgelux Reliability Report Number: BL-LM80-Vero 18-02
------------------------------------------------------------------------------------------------------------------- Confidential Page 1 of 15 November 19, 2013 Bridgelux Inc. ISO17025 Accredited http://www.Bridgelux.com 101 Portola Avenue, Livermore, CA 94551 PH: (925)583-8400
November 19, 2013
Bridgelux LM80 Report: 9,000 Hour Test Data
Bridgelux Vero 18 LED Array: BXRC-30E4000
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
Bridgelux Reliability Report Number: BL-LM80-Vero 18-02
------------------------------------------------------------------------------------------------------------------- Confidential Page 2 of 15 November 19, 2013 Bridgelux Inc. ISO17025 Accredited http://www.Bridgelux.com 101 Portola Avenue, Livermore, CA 94551 PH: (925)583-8400
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-30E4000
Color Temperature: 3000K
This report also covers the following products:
V6 V8 V10 Vero 10 Vero 13 Vero 18
All products with prefix BXRC- Warm White: 2700K, 3000K, 3500K 27E1000 30E1000 35E1000 27G1000 30G1000 27H1000 30H1000 27E2000 30E2000 27G2000 30G2000 27H2000 30H2000, 35E2000 27E4000 30E4000 27G4000 30G4000 27H4000 30H4000 35E4000 Neutral White: 4000K 4040E1000 40E2000 40E4000 Cool White: 5000K 50C1000 50C2000 50C4000
Bridgelux Reliability Report Number: BL-LM80-Vero 18-02
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All products with prefix BXRE- Warm White: 2700K, 3000K, 3500K 27E0400 27G0400 27E0500 27G0500 27E0800 27G0800 27E1000 27G1000 30E0400 30G0400 30E0500 30G0500 30E0800 30G0800 30E1000 30G1000 Neutral White: 4000K 40E0400 40E0500 40E0800 40E1000 Cool White: 5000K 50C0400 50C0500 50C0800 50C1000 50E0400 50E0800 50E1000
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.
Bridgelux Reliability Report Number: BL-LM80-Vero 18-02
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Operating Cycle
Test Condition
Number of units: 10 at 55ºC, 10 at 85ºC and 10 at 105ºC. Drive current: 2100mA constant current, per array Typical Voltage: 32.5V
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 350mA per diode was used during lifetime test.
Bridgelux Reliability Report Number: BL-LM80-Vero 18-02
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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)
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
DeviationMax Min
Initial Flux 5205.12 5030.30 5381.84 5015.76 5234.39 5073.98 5072.40 5166.38 5151.31 5237.12 5156.86 5158.85 113.26 5381.84 5015.76
Forward
Voltage32.58 32.71 32.35 32.73 32.31 32.77 32.72 32.79 32.72 32.87 32.66 32.72 0.19 32.87 32.31
CCT,K 3183.81 3187.18 3150.65 3071.40 3183.10 3133.17 3136.67 3150.86 3177.49 3172.47 3154.68 3161.66 35.44 3187.18 3071.40
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
DeviationMax Min
Initial Flux 5175.71 5095.27 5229.92 5173.80 5238.00 5137.81 5102.47 5166.37 5212.14 5145.64 5167.71 5170.08 49.18 5238.00 5095.27
Forward
Voltage32.19 32.23 32.94 32.86 32.31 32.95 32.88 32.92 32.88 32.87 32.70 32.87 0.32 32.95 32.19
CCT,K 3122.21 3126.67 3142.13 3147.28 3119.11 3142.70 3155.63 3130.90 3132.53 3095.77 3131.49 3131.72 17.03 3155.63 3095.77
Sample 1 Sample 2 Sample 3 Sample 4 Sample 5 Sample 6 Sample 7 Sample 8 Sample 9 Sample 10 Average MedianStandard
DeviationMax Min
Initial Flux 5190.70 5055.57 5342.99 5160.06 5069.65 5149.69 4966.18 5149.31 5019.20 5201.83 5130.52 5149.50 107.58 5342.99 4966.18
Forward
Voltage32.37 32.71 32.36 32.28 32.48 32.36 32.70 32.54 32.74 32.46 32.50 32.47 0.17 32.74 32.28
CCT,K 3185.96 3182.49 3179.21 3173.87 3176.53 3166.36 3094.52 3095.95 3098.98 3169.44 3152.33 3171.65 38.97 3185.96 3094.52
Bridgelux Reliability Report Number: BL-LM80-Vero 18-02
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Lumen Maintenance
Ambient temperature during lumen measurements was maintained at 25ºC ±2ºC Table 3: Lumen Maintenance at actual case temperature 55ºC
Figure 1: Lumen Maintenance at actual case temperature 55ºC
70%
75%
80%
85%
90%
95%
100%
105%
0 2000 4000 6000 8000 10000
Lum
en
Mai
nte
nan
ce
Stress durations,hrs
Hourssample
1
sample
2
sample
3
sample
6
sample
7
sample
12
sample
14
sample
17
sample
18
sample
19Average Median
Standard
DeviationMax Min
0 100.0% 100.0% 100.0% 100.0% 100.0% 100.0% 100.0% 100.0% 100.0% 100.0% 100.0% 100.0% 0.0% 100.0% 100.0%
1000 99.6% 99.6% 98.8% 99.3% 99.6% 99.4% 99.8% 100.0% 100.0% 99.2% 99.5% 99.6% 0.4% 100.0% 98.8%
2000 99.2% 99.0% 98.5% 99.1% 99.7% 99.0% 99.3% 99.4% 99.5% 93.8% 98.7% 99.2% 1.7% 99.7% 93.8%
3000 98.8% 98.9% 98.4% 99.0% 99.8% 98.7% 98.6% 98.7% 98.5% 100.1% 98.9% 98.8% 0.6% 100.1% 98.4%
4000 98.1% 98.3% 97.8% 98.5% 99.2% 98.1% 98.6% 98.4% 98.4% 99.8% 98.5% 98.4% 0.6% 99.8% 97.8%
5000 98.1% 98.2% 97.8% 98.6% 99.3% 97.8% 98.2% 98.2% 98.1% 99.3% 98.4% 98.2% 0.5% 99.3% 97.8%
6000 97.3% 97.6% 97.2% 98.0% 98.8% 97.2% 97.3% 97.4% 97.2% 98.3% 97.6% 97.4% 0.5% 98.8% 97.2%
7000 96.2% 96.6% 96.1% 97.3% 98.2% 96.7% 96.3% 96.6% 96.2% 97.3% 96.8% 96.6% 0.7% 98.2% 96.1%
8000 96.3% 96.6% 96.1% 97.3% 98.2% 96.6% 96.0% 96.5% 96.2% 97.2% 96.7% 96.5% 0.7% 98.2% 96.0%
9000 96.0% 96.5% 95.7% 97.1% 98.0% 96.0% 95.7% 96.3% 95.8% 96.9% 96.4% 96.1% 0.8% 98.0% 95.7%
Bridgelux Reliability Report Number: BL-LM80-Vero 18-02
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Table 4: Lumen Maintenance at actual case temperature 85ºC
Figure 2: Lumen Maintenance at actual case temperature 85ºC
Hourssample
1
sample
2
sample
3
sample
4
sample
7
sample
12
sample
16
sample
19
sample
22
sample
24Average Median
Standard
DeviationMax 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 98.21% 98.66% 98.36% 98.37% 98.98% 98.80% 98.92% 98.50% 99.15% 99.32% 98.73% 98.73% 0.37% 99.32% 98.21%
2000 97.19% 97.59% 97.53% 97.55% 98.11% 98.17% 97.76% 97.14% 98.29% 98.15% 97.75% 97.68% 0.42% 98.29% 97.14%
3000 96.62% 97.27% 96.88% 96.77% 97.35% 97.50% 96.95% 96.41% 97.73% 97.75% 97.12% 97.11% 0.47% 97.75% 96.41%
4000 95.86% 96.57% 96.64% 96.22% 96.82% 97.18% 96.21% 98.31% 97.10% 97.32% 96.82% 96.73% 0.70% 98.31% 95.86%
5000 95.40% 96.54% 96.18% 95.67% 96.50% 96.84% 95.68% 97.49% 96.55% 97.05% 96.39% 96.52% 0.66% 97.49% 95.40%
6000 95.09% 96.02% 95.60% 95.09% 95.75% 96.16% 95.01% 96.85% 95.98% 96.60% 95.81% 95.87% 0.64% 96.85% 95.01%
7000 94.61% 95.60% 95.07% 94.39% 95.28% 95.27% 94.19% 95.95% 95.28% 95.88% 95.15% 95.28% 0.60% 95.95% 94.19%
8000 94.08% 95.33% 94.63% 93.97% 95.00% 94.72% 94.04% 95.76% 95.15% 95.98% 94.87% 94.86% 0.71% 95.98% 93.97%
9000 92.84% 94.15% 93.34% 92.76% 93.76% 93.45% 93.11% 94.72% 94.19% 95.29% 93.76% 93.61% 0.83% 95.29% 92.76%
Bridgelux Reliability Report Number: BL-LM80-Vero 18-02
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Table 5: Lumen Maintenance at actual case temperature 105ºC
Hours sample1 sample3 sample5 sample7 sample8 sample9 sample11 sample12 sample17 sample20 Average MedianStandard
DeviationMax 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 97.41% 97.34% 97.70% 98.13% 97.16% 97.71% 98.24% 97.74% 97.11% 97.54% 97.61% 97.62% 0.38% 98.24% 97.11%
2000 95.27% 94.53% 96.14% 96.04% 95.13% 96.18% 96.73% 95.79% 95.55% 95.63% 95.70% 95.71% 0.63% 96.73% 94.53%
3000 94.04% 92.87% 95.18% 95.19% 94.07% 95.37% 95.54% 94.55% 94.21% 94.49% 94.55% 94.52% 0.81% 95.54% 92.87%
4000 93.09% 91.70% 94.17% 94.30% 93.39% 93.96% 94.50% 93.52% 94.07% 93.38% 93.61% 93.74% 0.81% 94.50% 91.70%
5000 92.63% 90.73% 93.47% 93.61% 92.91% 93.11% 93.59% 92.73% 93.54% 92.92% 92.93% 93.02% 0.86% 93.61% 90.73%
6000 91.74% 89.91% 92.39% 92.86% 92.27% 92.19% 92.64% 91.97% 92.70% 91.97% 92.06% 92.23% 0.84% 92.86% 89.91%
7000 90.95% 88.84% 91.93% 91.85% 91.35% 91.65% 91.47% 90.93% 92.01% 91.25% 91.22% 91.41% 0.92% 92.01% 88.84%
8000 90.79% 88.72% 91.83% 91.72% 91.25% 91.57% 91.19% 90.89% 91.89% 91.13% 91.10% 91.22% 0.92% 91.89% 88.72%
9000 89.68% 87.78% 90.63% 90.66% 90.26% 90.42% 90.04% 89.74% 90.67% 89.86% 89.97% 90.15% 0.86% 90.67% 87.78%
Figure 3 Lumen Maintenance at actual case temperature 105º
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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%
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Chromaticity Shift
Ambient temperature during chromaticity measurements was maintained at 25ºC ±2ºC Table 6: Chromaticity shift (Delta u’v’) at actual case temperature 55ºC
Figure 4: Chromaticity shift (Delta u’v’) at actual case temperature 55ºC
0.000
0.005
0.010
0.015
0.020
0.025
0 2000 4000 6000 8000 10000
De
lta
u'v
'
Stress durations,hrs
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
1000 0.0004 0.0004 0.0003 0.0005 0.0002 0.0004 0.0012 0.0013 0.0013 0.0004 0.0006 0.0004 0.0004 0.0013 0.0002
2000 0.0010 0.0008 0.0007 0.0007 0.0003 0.0007 0.0014 0.0014 0.0017 0.0016 0.0010 0.0009 0.0005 0.0017 0.0003
3000 0.0010 0.0009 0.0010 0.0008 0.0006 0.0009 0.0016 0.0020 0.0017 0.0039 0.0014 0.0010 0.0010 0.0039 0.0006
4000 0.0013 0.0011 0.0010 0.0010 0.0007 0.0011 0.0017 0.0023 0.0022 0.0029 0.0015 0.0012 0.0007 0.0029 0.0007
5000 0.0015 0.0014 0.0013 0.0014 0.0011 0.0014 0.0021 0.0026 0.0025 0.0027 0.0018 0.0015 0.0006 0.0027 0.0011
6000 0.0016 0.0017 0.0016 0.0015 0.0012 0.0016 0.0022 0.0028 0.0028 0.0024 0.0019 0.0016 0.0006 0.0028 0.0012
7000 0.0018 0.0018 0.0017 0.0017 0.0013 0.0018 0.0023 0.0030 0.0031 0.0022 0.0021 0.0018 0.0006 0.0031 0.0013
8000 0.0019 0.0019 0.0018 0.0017 0.0015 0.0019 0.0026 0.0031 0.0030 0.0023 0.0022 0.0019 0.0006 0.0031 0.0015
9000 0.0019 0.0018 0.0019 0.0017 0.0014 0.0019 0.0025 0.0030 0.0030 0.0021 0.0021 0.0019 0.0005 0.0030 0.0014
Bridgelux Reliability Report Number: BL-LM80-Vero 18-02
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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
DeviationMax 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 0.0018 0.0017 0.0020 0.0019 0.0014 0.0021 0.0019 0.0028 0.0013 0.0013 0.0018 0.0018 0.0004 0.0028 0.0013
2000 0.0020 0.0019 0.0020 0.0022 0.0011 0.0022 0.0014 0.0025 0.0014 0.0009 0.0018 0.0019 0.0005 0.0025 0.0009
3000 0.0022 0.0020 0.0024 0.0024 0.0018 0.0023 0.0012 0.0020 0.0010 0.0008 0.0018 0.0020 0.0006 0.0024 0.0008
4000 0.0022 0.0018 0.0025 0.0029 0.0023 0.0028 0.0005 0.0007 0.0003 0.0005 0.0017 0.0020 0.0011 0.0029 0.0003
5000 0.0026 0.0024 0.0027 0.0032 0.0026 0.0032 0.0002 0.0004 0.0001 0.0002 0.0018 0.0025 0.0013 0.0032 0.0001
6000 0.0027 0.0024 0.0027 0.0033 0.0025 0.0033 0.0001 0.0002 0.0004 0.0001 0.0018 0.0025 0.0014 0.0033 0.0001
7000 0.0025 0.0021 0.0029 0.0034 0.0025 0.0033 0.0001 0.0001 0.0002 0.0001 0.0017 0.0023 0.0014 0.0034 0.0001
8000 0.0028 0.0023 0.0030 0.0034 0.0025 0.0035 0.0000 0.0000 0.0001 0.0002 0.0018 0.0024 0.0015 0.0035 0.0000
9000 0.0025 0.0021 0.0026 0.0031 0.0023 0.0034 0.0000 0.0000 0.0000 0.0000 0.0016 0.0022 0.0014 0.0034 0.0000
Figure 5: Chromaticity Shift (Delta u’v’) at actual case temperature 85ºC
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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
DeviationMax 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 0.0019 0.0017 0.0016 0.0016 0.0017 0.0017 0.0017 0.0016 0.0016 0.0017 0.0017 0.0017 0.0001 0.0019 0.0016
2000 0.0020 0.0022 0.0016 0.0014 0.0023 0.0015 0.0017 0.0020 0.0017 0.0021 0.0019 0.0018 0.0003 0.0023 0.0014
3000 0.0024 0.0027 0.0021 0.0020 0.0024 0.0020 0.0022 0.0024 0.0020 0.0022 0.0023 0.0022 0.0002 0.0027 0.0020
4000 0.0030 0.0034 0.0026 0.0026 0.0030 0.0028 0.0030 0.0029 0.0025 0.0028 0.0029 0.0029 0.0003 0.0034 0.0025
5000 0.0034 0.0037 0.0027 0.0028 0.0032 0.0028 0.0031 0.0033 0.0029 0.0031 0.0031 0.0031 0.0003 0.0037 0.0027
6000 0.0032 0.0040 0.0027 0.0030 0.0032 0.0030 0.0032 0.0034 0.0030 0.0033 0.0032 0.0032 0.0004 0.0040 0.0027
7000 0.0034 0.0038 0.0028 0.0026 0.0030 0.0026 0.0030 0.0031 0.0029 0.0032 0.0030 0.0030 0.0004 0.0038 0.0026
8000 0.0033 0.0038 0.0028 0.0027 0.0030 0.0027 0.0030 0.0032 0.0030 0.0033 0.0031 0.0030 0.0003 0.0038 0.0027
9000 0.0032 0.0039 0.0025 0.0026 0.0030 0.0028 0.0029 0.0032 0.0028 0.0031 0.0030 0.0029 0.0004 0.0039 0.0025
Figure 6: Chromaticity shift (Delta u’v’) at actual case temperature 105ºC
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Figure 7: Drawing for Vero 18 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: Keithley Model: 2410 Last Calibration Date: 09/23/13 Next Calibration Due Date: 09/23/14
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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
Bridgelux Reliability Report Number: BL-LM80-Vero 18-02
------------------------------------------------------------------------------------------------------------------- Confidential Page 15 of 15 November 19, 2013 Bridgelux Inc. ISO17025 Accredited http://www.Bridgelux.com 101 Portola Avenue, Livermore, CA 94551 PH: (925)583-8400
Prepared By /Date: Verified by:
Farid Ahmed/11-20-13 Phil Elizondo /11-20-13 Reliability Development Engineer Director, Reliability
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