Patent ID: 9159885
Filing Date: 2015-10-13
Classification: F21K,F21V,F21Y,H01L,H05B

Abstract:
1. A light source for emitting broadband output light, comprising: a first and second LED adapted to emit first and second LED light respectively; a layer of phosphor material adapted to emit first longer wavelength phosphor light in response to excitation from light emitted by the first LED and second longer wavelength phosphor light in response to excitation from light emitted by the second LED; and a dichroic reflector configured to reflect at least a portion of the first LED light, and at least a portion of the second LED light, onto the layer of phosphor material in such a way that as light propagates from the first and second LEDs to the dichroic reflector it does not pass through the layer of phosphor material, the dichroic reflector substantially transmitting light at the first and second longer wavelengths so that such transmitted first and second longer wavelength phosphor light is included in the broadband output light of the light source; wherein the first longer wavelength phosphor light and optionally a remaining portion of the first LED light provide a first broadband light portion for the light source, and the second longer wavelength phosphor light and optionally a remaining portion of the second LED light provide a second broadband light portion for the light source, the broadband output light of the light source comprising the first and second broadband light portions; and wherein the first broadband light portion has a first color, and the second broadband light portion has a second color that differs from the first color.