have a metal halide question ..........

Kelvin rating is the color of the bulb. 10k is white to yellow depending on the bulb. The higher the number the bluer the bulb. Anything 14k to 20k looks nice without actinics. The higher kelvin rating the slower growth you will get .
 
You won't need to supplement it if you buy a bluer MH bulb. Like Oscarsdad, I agree that 10K looks too white. So buy one with a higher K rating and you won't need to supplement it.
 
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