Patent ID: 9642208
Date: 2017-05-02
CPC Classifications: F21K,F21V,F21Y,H01L,H05B

Claim:
1. A lighting device comprising: plural excitation sources configured to provide at least two excitation peak emissions of different wavelength; at least one phosphor material radiationally coupled to the plural excitation sources and differently excited by the at least two excitation peak emissions of different wavelength; and at least two operational states comprising: a first operational state wherein emission by the at least one phosphor material upon excitation by the plural excitation sources contributes to a first correlated color temperature (CCT) value for the lighting device; and at least one additional operational state wherein the at least two peak emissions of different wavelengths are altered from that of the first operation state and emission by the at least one phosphor material upon excitation by the altered plural excitation sources contributes to at least one additional CCT value for the lighting device, wherein the at least one additional CCT value is different from the first CCT value; wherein the color rendering index (CRI) values of both the first and the second operational states are at least 81 for CCT values of between 2200 to 4500.