Patent ID: 8436526

Claim:
A light source comprising: at least two sets of visible-light emitters, each set of emitters having a primary color, wherein the at least two sets of visible-light emitters are configured using a method comprising: selecting at least one of: the primary colors or relative fluxes generated by each set of emitters such that when a plurality of test color samples including more than fourteen test color samples resolved by an average human eye as different are illuminated using the light source having a predetermined correlated color temperature instead of a reference light source having the predetermined correlated color temperature, for a maximum number of the plurality of test color samples: chromaticity shifts resulting from use of the light source instead of the reference light source are preserved within corresponding regions of a chromaticity diagram, each region defined by a color at a center of the region and a predetermined chromaticity variation value from the color at the center of the region, wherein the predetermined chromaticity variation value is a 3-step MacAdam ellipse; and lightness shifts resulting from use of the light source instead of the reference light source are preserved within a predetermined lightness variation value, wherein the lightness variation value is approximately 2%.