Patent ID: 8981389
Filing Date: 2015-03-17
Classification: F21K,F21V,F21Y,H01L

Abstract:
1. An illumination device, comprising: a base; a light-emitting module disposed on the base for generating a progressive-type light-emitting intensity; a first layer encapsulating the light-emitting module; and a second layer enclosing the first layer and having a phosphor powder, wherein the second layer has a progressive-type concentration of the phosphor powder corresponding to the progressive-type light-emitting intensity, both the progressive-type light-emitting intensity and the progressive-type concentration of the phosphor powder are decreased or increased gradually, and the progressive-type light-emitting intensity is transformed into the same light-emitting intensity through the progressive-type concentration of the phosphor powder in the second layer; wherein the light-emitting module includes at least one optoelectronic component disposed on the base and directly under a topmost point of the first layer, the progressive-type light-emitting intensity generated by the at least one optoelectronic component is a function of θ defined by I(θ)=I