Momentary adjustment means for simulating the sunlight color temperature, hues and brightness with RGB LEDs in indoor lighting

A method for simulating the sunlight color temperature, hues and brightness immediately by adjusting the intensity of RGB LEDs in indoor lighting was proposed. Illuminating uniform with the light box, the ratio of RGB intensity could be found and calculated by measuring the CIE chromaticity coordinate x and y with chroma meter. After the chromaticity coordinate x and y was found by the chroma meter, the tristimulus values XYZ could be calculated with the chromaticity coordinate, and then transferred to RGB primaries by a linear transformation. When getting the ratio of RGB intensity, the outdoor sunlight color temperature, hues and brightness could be rebuilt by adjusting the ratio of RGB LEDs. It provides a sunlight alike lighting in indoor environment, especially for those indoor spaces that don’t have any windows to receive the sunlight.