It's also a measurement you might be familiar with, in high end digital cameras.
Most newer DSLR's, in addition to having preset light settings (ex. Tungsten, Fluroescent, Daylight) they'll have a manual mode to adjust the light balance.
The color measurements will often be in Kelvin.
I picked up a very small personal flashlight recently that uses one of these spectacular LEDs. It's called the Fexix PD30. Uses two CR123s. Rated at up to 265 lumens in turbo mode (strobe effect). It's insanely bright. Only 1.5 hours of run time that way (vs. up to 6 hours at a lower setting).
Might make a short 3/4" blade socket for it. It'd make a cool saber dagger.
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