This standard covers the objectives and tolerances for the chromaticity of T8, T10 and T12 fluorescent lamps with a nominal loading of from 5 to 10 watts per foot at their normal 100 hour rating point. This standard also covers some compact lamps, where noted. The colors included are 2700K, 3000K/warm white, 3500K/white, 4000K/4100K/cool white, 5000K, and 6500K/daylight. The lamp under test shall be operated under reference conditions as specified in ANSI C78.375 Guide for Operation of Fluorescent Lamps and in the relevant C78 lamp standard.