Lighting (MH who is the cheapest)

[Josh_22]

Im looking to buy 2 or 3 250 watt MHs (retro Kit)for a 6 foot long 180 gallon tank. I was woundering if any of you know of a cheap place to purchase lighting or better yet a DIY plan that would cost less and still be efficent.

Also because of the lenght I know that I should have 3 MH lights but would it be possible to use 2 and still keep stoney corals(these would be placed directly under the lights and keep soft corals on the outside. Just a thought
JOSH