Here is a 175W Chinese 10K metal halide aquarium lamp.
Manufacture date: Circa 2008
Colour temp: 10000K
CRI: 65
Base: Mogul E39
Lamp shape: T15
Made in: China
Lamp life: ~ 10000 hours
Ballast: M57
10,000K and similar high kelvin indium iodide lamps, often used in Israel as colored metal halide lamps or as daylight MH lamps, for area floodlighting. Their spectra consist of a very wide indium iodide blue and violet lines with a thin black reabsorption line on the shortest wavelength direction and a very strong molecular continum, because of the large dose or pressure of the indium iodide.
Btw, i saw this spectral phenomenon of the 10,000K MH lamps also in several green MH lamps. Green MH which exhibited this spectral phenomenon of the 10,000K MH lamps, have a more of a pastel whitish green color, or even yellowish green color.
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It would be interesting to see a 10K (10000deg K) lamp lit I have two of these but in 20K (20000 deg K and they give a deep Blue Light.
All the Best
Colin
Btw, i saw this spectral phenomenon of the 10,000K MH lamps also in several green MH lamps. Green MH which exhibited this spectral phenomenon of the 10,000K MH lamps, have a more of a pastel whitish green color, or even yellowish green color.