Luminous Intensity Degradation Data Emerald Green LEDs (560 Degradatio
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Luminous Intensity Degradation Data Emerald Green LEDs (560 Degradation Data Standard Green LEDs (569 Application Note
Summary: During product development Emerald Green LEDs, HewlettPackard noticed that this product family exhibits larger standard deviation luminous intensity degradation standard operating life tests compared Standard Green product family. tests have indicated that this phenomenon unique Hewlett Packard Emerald Green products, material related exists some degree Emerald Green LEDs based this material system. Therefore, advisable factor this phenomenon your designs where multiple illuminations placed near proximity luminous intensity matching desirable.
This application note reports luminous intensity, degradation differences between Emerald Green Standard Green lamp devices. This qualification test data Emerald Green compared Standard Green reliability test data operating life tests outlined below. tests conducted, these tests revealed larger standard deviation degradation compared Standard Green products. High Temperature Operating Life, HTOL, test data, average percentage luminous intensity degradation Emerald Green does look much different than Standard Green after 1000 hours stress; -28.4% -20.1% respectively 100).
significance data standard deviations. Emerald Green data show larger data spread within single sample. example, after 1000 hours HTOL Emerald Green data standard deviation 16.2, while standard green data standard deviation 3.8. same trend continues Room Temperature Operating Life, RTOL, test data. Again, average percentage luminous intensity degradation Emerald Green does look much different than Standard Green after 1000 hours stress; -24.5% -16.2% respectively 100). standard deviations ranged from 12.2 respectively Emerald Green Standard Green.
High Temperature Operating Life Luminous Intensity Degradation Mean Standard Green Emerald Green -20.1% -28.4% Standard Deviation 16.2
Test High Temperature Operating Life (HTOL) Conditions: +55°C, tested
Room Temperature Operating Life Luminous Intensity Degradation Mean Standard Green Emerald Green -16.2% -24.5% Standard Deviation 12.2
Test Room Temperature Operating Life (RTOL) Conditions: +25°C, tested
technical assistance location your nearest Hewlett-Packard sales office, distributor representative call: Americas/Canada: 1-800-235-0312 East/Australasia: (65) 290-6305 Japan: 3331-6111 Europe: Call your local sales office listed your telephone directory. Components representative. Data subject change. Copyright 1995 Hewlett-Packard Printed U.S.A. 5091-7778E (10/93)
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