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Hermetically Sealed LEDs and VOCs

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Hermetically Sealed LEDs and VOCs

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This application note explains some adverse effects of VOCs on LEDs and how VOCs can affect them as well as preventive measures. In outdoor light fixtures such as headlamps, street lights, and floodlights, there are cases where the fixture is hermetically-sealed in order to protect it from moisture/dust. Light fixture materials used around LEDs (surrounding materials) may outgas volatile components when they are exposed to heat and light, and if the LED is used in an environment where the light fixture is hermeticallysealed, the concentration of the outgassed components may become high and the LED can be adversely affected by the components. Some components outgassed from materials may contain volatile organic compounds (VOCs), some of which can react and discolor under the exposure to heat and light energy.

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