The color of the light may be converted. The easiest, most practical, and most common method is to configure a special color filter in front of the light source (or luminaire) to obtain a new light color.
There are two main types of color filters: color temperature conversion filters (or color temperature correction filters) and color light filters. The color filter has optical characteristics that selectively absorb light. For example, the color filter medium has different proportions of absorption of light of each wavelength of the visible spectrum, which changes the spectral relative energy distribution of the light source, and the transmitted light stimulates the human eye to induce Different from the light color effect of the light source. Color filters of different chromatic colors have different spectral transmittance curves, which convey the optical properties of their different selective absorption.