Best Kelvin Color Spectrum

I find it rather interesting that different companies of metal halides use different color spectrums for metal halides. I won't name each company attacked to what "kelvin" as I'm new here (apologies) and am unsure if that's allowed.

So some 1000 watt metal halides use 4200k. Some use 4700k. Some, 5,500k. Others 6,000k. And finally, 6,500k.

The question is, what is best during veg? The higher kelvin in the blue spectrum?

the best is a balanced spectrum like sunlight. back in the day it was MH for veg and HPS for flower. now, spectrums are closer to sunlight.

if you want the best MH, get a hortiliux mh blue daylight. alot of research labs use it as the bulb for closest to sunlight.