With a halogen light you're going to cook your plants... literally. Literally. Literally.

I've seen chicken roasting ovens that use halogen lights as their heat source. As their heat surce!

If possible, get some CFLs (flourescents) for the vegetative stages, than a HPS for flowering. If you've got the $, buy a MH. Use the CFLs for seedlings, then use MH for vegetative... then, use HPS for flower.

What'da think?