Best color temp for veg vs flower?

I am getting a new metal halide for a veg cycle, and was wondering, is a 10,000K bulb any better than a 4200K bulb for vegetative only?

Also for HPS, what color temp should I go for, I am thinking about an Ultra Sun at 2000K, or maybe Eye Hortilux, though I'm unsure of the color temperature. It apparently contains far more blue and green, though that shouldn't be good for flower, right? Though not enough blue spectrum can lead to stretching, of course I would like to use as efficient lighting as possible.

Ligerius said:

I am getting a new metal halide for a veg cycle, and was wondering, is a 10,000K bulb any better than a 4200K bulb for vegetative only?

Also for HPS, what color temp should I go for, I am thinking about an Ultra Sun at 2000K, or maybe Eye Hortilux, though I'm unsure of the color temperature. It apparently contains far more blue and green, though that shouldn't be good for flower, right? Though not enough blue spectrum can lead to stretching, of course I would like to use as efficient lighting as possible.

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NO

a 10k bulb is also known as a Finishing bulb ......yes it does have deep blue but it also has a higher UVb/c rating to it for making resin glands form to protect the plant from the UVb/c

stick to a normal MH for veggie it has very little UV in it at all so much safer for young plants and your eyes

u are trying to get photosynthesis ....now with Hid lighting they still measure it in waves plus Luxs ( leds are rated in PAR Photosynthetically Active Radiation)
http://www.botany.uwc.ac.za/ecotree/photosynthesis/spectrum.htm

and the way color works (all colors) the light hitting the object is absorbing all the ligh waves but the one it is reflecting making it visible ........white reflects everything making it white black absorbs all light-waves making it look black
so green light on plants have NO effect at all

this is why u can use a green light bulb in a flowering room after the lights have gone out (the plant is not absorbing anything to them it is still night ) but we can see with the light reflecting off the area
it is also why animals that only see in black and white do not run when they are hit with a red spotlight (they do not see it)