Light quantity adjustment

Patent Granted PROBLEM TO BE SOLVED: To adjust the quantity of light in each light source so that luminance or spectral distribution is uniformed spatially with a simple configuration in a lighting system using a plurality of light sources. ; SOLUTION: The images of a liquid crystal monitor are photographed by a digital camera (step S101). The spectral distribution of measurement points is estimated from the RGB pixel values of measurement points and chromaticity and luminance are calculated (steps S102, S103).