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A typical "cool white" fluorescent lamp utilizing two rare-earth-doped phosphors, Tb 3+, Ce 3+:LaPO 4 for green and blue emission and Eu:Y 2 O 3 for red. For an explanation of the origin of the individual peaks click on the image. Several of the spectral peaks are directly generated from the mercury arc.
For example, if the last two digits on a lamp say 41, that lamp's color temperature will be 4100 K, which is a common tri-phosphor cool white fluorescent lamp. BL is used for ultraviolet lamps commonly used in bug zappers.
A compact fluorescent lamp (CFL), also called compact fluorescent light, ... Neutral White: 3500: 286 Cool white 4000—4100 250—243 Daylight 5000—6500
Warm white compact fluorescent and LED lamps 3200 K Studio lamps, photofloods, etc. 3350 K Studio "CP" light 5000 K Horizon daylight, Tubular fluorescent lamps or cool white/daylight compact fluorescent lamps (CFL) 5500–6000 K Vertical daylight, electronic flash: 6200 K Xenon short-arc lamp [10] 6500 K Daylight, overcast 6500–9500 K
Illuminants D (1967) represent variations of daylight, illuminant E is the equal-energy illuminant, while illuminants F (2004) represent fluorescent lamps of various composition. There are instructions on how to experimentally produce light sources ("standard sources") corresponding to the older illuminants.
daylight fluorescent F2 0.37208: 0.37529 0.37925: 0.36733 4230 cool white fluorescent F3 0.40910: 0.39430 0.41761: 0.38324 3450 white fluorescent F4 0.44018: 0.40329 0.44920: 0.39074 2940 warm white fluorescent F5 0.31379: 0.34531 0.31975: 0.34246 6350 daylight fluorescent F6 0.37790: 0.38835 0.38660: 0.37847 4150 light white fluorescent F7 0. ...