PhotoMEtrICDEPEnDEnCIEs
LEDs emit light that is characterized by flux and chromaticity. These photometric properties depend on the device materials, forward
current through the LED and temperature of the LED junction.
General rules of thumb for white LEDs:
1. As the junction temperature of a device increases, flux decreases and the CCT of that device decreases (shifts toward a warmer color
temperature).
2. As the forward drive current of a device increases, flux increases and the CCT of that device increases (shifts toward a cooler color
temperature).
ConCLusIon
Just like traditional lamps, LEDs are binned for brightness (lumens) and color (chromaticity). Unlike traditional lighting design, LED color
mixing can help multi-LED products take the best advantage of LED performance. LED color mixing is an effective technique to achieve
consistent, repeatable, multi-LED luminaires. Color mixing also allows the use of a large chromaticity range while reducing LED unit
costs and delivering consistent color point results. Cree’s EasyWhite LEDs help simplify luminaire design by mixing colors within the LED
component.