The effect of fluorescence glue on the traditional packaging of white LED, fluorescence glue is generally epoxy resin or silica gel, through the results of the light decay experiment, using silica gel powder white LED life is significantly longer than the epoxy resin. One of the reasons is the use of the two methods above encapsulated into finished LED, silicone than epoxy resin UV resistance and silicone heat dissipation effect is better than epoxy resin; However, under the same conditions, the initial brightness of silica gel powder is lower than that of epoxy resin powder, mainly because the refractive index of silica gel (1.3-1.4) is lower than that of epoxy resin (1.5 or above), so the initial light effect is not as high as that of epoxy resin.