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When an object is illuminated, part of the incident light is absorbed by the object that does not contribute to the illumination. If the light source&#x0027;s spectrum can be optimized by decreasing the light energy along the absorbed wavelengths, substantial energy can be saved. In this study, a spectrum optimization method by means of a genetic algorithm to minimize the light energy along the absorbed wavelengths while maintaining the light quality of the light source was proposed. Under the constraint that the color differences of the object illuminated by the optimized illuminant and the reference illuminant do not exceed specified levels, maximum energy saving ratio (ESR) is achieved for various reference illuminants. It is found that through the proposed method effectively saving the energy, for a monochromatic object, the ESR can reach 49.5&#x0025; with barely recognizable color difference, whereas for a polychromatic object, the ESR can reach 55.2&#x0025; with an acceptable color difference for each patch of the object.

Energy-Saving Light Source Spectrum Optimization by Considering Object's Reflectance