The most common is the last LED epoxy resin
after aging, but will gradually turn yellow (due to "benzene ring"
component), thereby affecting bright colors, especially when the
wavelength of the lower the aging more rapidly, especially in the use
of near ultraviolet light-emitting part of the WLED with other
wavelength than visible light, another less, aging faster. The new
proposal is to use silicone resin (silicone) change for the epoxy
resin, such as the U.S. Lumileds company's Luxeon series of LED that is
switched to silicone rubber seal.
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