The Kelvin rating, abbreviated K, refers to a guage of the spectrum that the lighting emits. Kelvin is a unit of temperature and is related to degrees Celsius using the following conversion K = ^oC + 273.15. The rating is based on the spectrum that a perfect blackbody emits when heated to a given temperature. Therefore, a bulb rated at 10,000 K means that it emits a spectrum that is approximately like that of a perfect blackbody heated to 10,000 K.

It must be remember that these ratings are very approximate, since a metal halid and flourescent light emit light in discret bands, it is not a continous spectrum as would be emitted by a perfect blackbody. So two different lights that are giving the same K rating can look very different to the eye.

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