Difference between revisions of "ANSI White"

This standard was adopted by [[Cree]] (and Luminus, see below) to describe the tint of their LED products. First they numbered the quadrangles 1 through 8 starting with 6500K. They developed the concept further by dividing each ANSI quadrangle into four quadrants to get bins like 1A, 1B, 1C, and 1D being divisions of quadrangle 1 (6500K). Towards the cold end of the spectrum a non-ANSI quadrangle, quadrangle 0, was added. Tints lying outside of the ANSI standard, above and below quadrangles 0, 1, 2, 3, 4, and part of 5, are given names like 1R, 1S, 1T, and 1U. Cree subdivides regions 5, 6, 7, and 8 into even smaller subdivisions to get bins like 5A1, 5A2, 5A3, and 5A4. This gives a total of 16 different bins in one ANSI quadrangle. In the graphic below, the ANSI quadrangles are in red with the Cree bins overlaid on them (click for a larger version).

[[Luminus]] does something similar by subdividing the standard ANSI quadrangles and adding their own outside of those limits.