We usually describe our LEDs according to their light output and their colour.
To make this process more exact, rather than describing our LEDs just as “Cool White”, or “Very Cool White”, or “Slightly More Neutral Than Cool White”, we use a “bin” to describe the colour.
For example, our CREE XP-G2 Cool White LEDs are currently available in 0D, 1D and 1C colour bins.
Looking at CREE’s tint chart below, 0D is around 7000K, and both 1D and 1C are around 6000K, with 1C having more of a green tint than the 1D that has more of a red tint.
Another set of bins describe the amount of light that is output by the LED.
For example, our CREE XP-G2 Cool White LEDs are currently available in S3 and S2 output bins.
Looking at the CREE XP Binning & Labelling Datasheet, the S2 bin means the LED will output 148 lumens at 350mA, and an LED binned at S3 will output 156 lumens at the same conditions.
LEDbloke Combined Bins
As a note, we combine both the output bins and colour bins on our listings, e.g. a CREE XP-G2 Cool White LED with an S3 output bin and 0D colour bin is listed as S3 0D.
Similarly, a CREE XP-G2 Cool White with an S2 output bin and 1C colour bin is listed as S2 1C.