1600K / 2000K / 2200K / 2400K / 2700K / 3000K / 4000K / 5500K / 6500K / +......

The color temperature of the electromagnetic radiation emitted from an ideal black body is defined as its surface temperature in Kelvin, or alternatively in mireds(micro-reciprocal Kelvin).[4] This permits the definition of a standard by which light sources are compared

To the extent that a hot surface emits thermal radiation but is not an ideal black-body radiator, the color temperature of the light is not the actual temperature of the surface. An incandescent lamp's light is thermal radiation, and the bulb approximates an ideal black-body radiator, so its color temperature is essentially the temperature of the filament. Thus a relatively low temperature emits a dull red and a high temperature emits the almost white of the traditional incandescent light bulb

Many other light sources, such as fluorescent lamps, or LEDs (light emitting diodes) emit light primarily by processes other than thermal radiation. This means that the emitted radiation does not follow the form of a black-body spectrum. These sources are assigned what is known as a correlated color temperature (CCT). CCT is the color temperature of a black-body radiator which to human color perception most closely matches the light from the lamp. Because such an approximation is not required for incandescent light, the CCT for an incandescent light is simply its unadjusted temperature, derived from the comparison to a black-body radiator.

Temperature Source
1,700 K Match flame, low pressure sodium lamps (LPS/SOX)
1,850 K Candle flame, sunset/sunrise
2,400 K Standard incandescent lamps
2,550 K Soft white incandescent lamps
2,700 K "Soft white" compact fluorescent and LED lamps
3,000 K Warm white compact fluorescent and LED lamps
3,200 K Studio lamps, photofloods, etc.
3,350 K Studio "CP" light
4,100–4,150 K Moonlight[2]
5,000 K Horizon daylight
5,000 K Tubular fluorescent lamps or
cool white/daylight compact fluorescent lamps (CFL)
5,500–6,000 K Vertical daylight, electronic flash
6,200 K Xenon short-arc lamp[3]
6,500 K Daylight, overcast
6,500–9,500 K LCD or CRT screen
15,000–27,000 K Clear blue poleward sky
These temperatures are merely characteristic;
considerable variation may be present.