Tell us more about the space -

Is it drywall, is it a shed, do you have drop ceilings, what about current air circulation, concrete floors, dirt floors? When your talking about a space that large there are several things to take into consideration.

I have a 10x10 that I'm getting ready to prepare to setup, and I'm either going to use 1 1k lamp, or two 600's, if I go with the 1k I'll be adding sufficient side lighting to make up the difference.

Alot of this also has to do on how your planning on growing - Soil? Hydro? What style? How many plants are you considering, etc

I'll be more than happy to help, you can message me by using the purple icon by my name (instant message is better than email) or you can skype me.