A tunable white LED ceiling light is a multi-channel LED system that allows the color temperature and intensity of the emitted light to be adjusted across a defined range. Color is an expression of light, which provides vision for the eye and thereby allows the human mind to create worlds of perception. Tunable white lighting provides the technical ability to dynamically tune the light spectrum, making it a breeze to change the tint of white light between warm, neutral, and cool white. The color, or more precisely, the chromaticity of a light source is determined by the amount of energy at the various wavelengths in the visible portion of the electromagnetic spectrum. White light is a mixture of optical radiation in different colors. The ratio at which the colors are mixed determines the perceived warmth or coolness of white light, which is intuitively represented a color temperature. The concept of color temperature is based on based on the comparison of the chromaticity coordinate of a visible light source to that of an ideal black-body radiator. Correlated color temperature (CCT) is intended to characterize the apparent tint of white light emitted by light sources, e.g., LEDs and fluorescent lamps, whose chromaticity coordinates may not land exactly on the blackbody or the Planckian locus.
at the Open Lighting Product Directory (OLPD)
