LED Terms


McAdam ellipse - This is a region on a chromaticity diagram that will contain all the colors that the human eye is not able to distinguish between.

Black Body line - – (known as Planck’s Law) Is the visual representation on a color diagram that designates the color temperature of a light source expressed as absolute temperature (kelvin)

Color Rendering Index - This is a percentage of a LED light based from a natural light source.


Binning - Sorting LEDs so they all have a similar light output.

Correlated Color Temperature (CCT) - This is the appearance of a LED defined in degree Kelvin.

Kelvin - This is a measurement to describe the color temperature of a light source.

Lumens/Watt - It is the measurement on how well a light source produces light.


Cree LED Binning
LED Engines vs. Modules vs. COBs