Fight blue light emissions of white LEDs with new colour sensor

LEDs, and especially those that produce white light, are great for lighting applications. They consume little power in comparison to incandescent lightbulbs and it is easy to create nice colour effects with them. To produce white light a white LED often generates blue light and filters it with yellow or orange phosphor. Unfortunately, blue-light wavelengths appear to have important health effects such as disruption of the circadian rhythm, accelerated eye aging, and eye strain. The AS7264N tri-stimulus colour sensor by ams can measure blue-light wavelengths accurately, and is therefore suitable for human-centric lighting. The sensor’s on-wafer silicon interference filters create spectral channels that match the CIE 1931 XYZ standard observer model while two additional filters allow accurate measurements of blue light intensities at the 440 nm and 490 nm wavelengths.