Bin code is an abbreviation of binning, which stands for class division. The bin code is a code in which the characteristic values for the color and brightness perception of light-emitting lighting fixtures, lamps and light-emitting diodes(LEDs) are grouped into classes.
The bin code is a letter- digit combination composed of luminous intensity, hues, forward voltage and emission color. The newer bin codes are registered as color areas in the CIE color space. The first letter of the bin code represents the luminous intensity, with gradations ranging from "S" to "T" to "U", with "S" being very good.
The following two letters or letter-digit combinations stand for binning and are identified as color areas in the CIE color space. For example, "WE" stands for "best possible". The last letter stands for the forward voltage (Vf). The letters that come first in the alphabet, such as "G", indicate a low Forward Voltage (Vf) and a better finish than the following "H", "J", "K", "M" and "N". The voltage values range from 2.31 V to 8.31 V.
The bin code distinguishes between white, royal blue, blue- green, green, yellow-green, yellow, yellow-orange, orange and red for the emission colors, whereby the individual colors are subdivided several times in terms of wavelength. For the color shades of white, the Bin Code recognizes five gradations between greenish to slightly violet. The white range, which consists of many shades of white, is particularly interesting for the development of white LEDs, WLEDs. It is divided into many color areas between cool white, neutral white and warm white, some of which have the same correlated color temperature, Correlated Color Temperature( CCT).