Patent ID: 8870617
Filing Date: 2014-10-28
Classification: F21K,F21V,F21Y,G01J,H01L,H05B,Y10T

Abstract:
1. A method comprising: measuring a first color of light emitted from an LED based illumination device in response to a first current supplied to the LED based illumination device, the LED based illumination device including a first LED configured to receive the first current, wherein light emitted from the first LED illuminates a first amount of a first wavelength converting material and a second amount of a second wavelength converting material; measuring a second color of light emitted from the LED based illumination device in response to a second current supplied to the LED based illumination device, the LED based illumination device including a second LED configured to receive the second current, wherein light emitted from the second LED illuminates a third amount of a third wavelength converting material and a fourth amount of a fourth wavelength converting material; and determining a material modification plan based at least in part on the first color of light and the second color of light that includes a modification of the first amount of the first wavelength converting material, a modification of the second amount of the second wavelength converting material, a modification of the third amount of the third wavelength converting material and a modification of the fourth amount of the fourth wavelength converting material, wherein the LED based illumination device, modified in accordance with the material modification plan, emits a third color of light in response to the first current within a predetermined tolerance of a first target color point and emits a fourth color of light in response to the second current within a predetermined tolerance of a second target color point.