Bridgelux LM80 summary for W0802grow-up-led.e-monsite.com/medias/files/bridgelux-vero-18-9000... · AQL “Zero Based Acceptance Sampling Plan” has been used to pick samples from

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



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



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.



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.



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



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%



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%



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



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

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



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



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



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



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/11-20-13 Phil Elizondo /11-20-13 Reliability Development Engineer Director, Reliability

Documents

Bridgelux LM80 summary for W0802grow-up-led.e-monsite.com/medias/files/bridgelux-vero-18-9000... · AQL “Zero Based Acceptance Sampling Plan” has been used to pick samples from