P.S. To address the original question of the thread (I had a similar one which is how I stumbled upon this subject) here is how my growroom works...
I have a 1000W HPS for flowering, but I also use it for vegging when it is on during it's 12 hour cycle. It comes on around 8:00 AM (I usually get up an hour or two later...meh it's summer!) at which time I move the plants from my vegging area into the flowering room and turn off the four 4' 6500K 40 watt fluoro tubes I have them under at night, thus saving energy. I only have two plants actually flowering right now under the 1000W, which is why I didn't really want to waste a bunch of energy just for those two plants, so I started putting the vegging mothers underneath, too, and since then they have actually been doing very, very well. I think it's because they get lots of the "blue" spectrum light during the night until whenever I get up, and then they get about 10 hours or less under the HPS which offers much greater light penetration.
I have a separate window area where I keep a clone chamber (it's actually my snakes old tank which does the trick nicely), where I have three 30W 6500K CFLs spread out over a bunch of clones about 2 or 3 inches from their tops with high humidity levels.
I do have a question, though, about the clones. When I move them from the clone chamber, would it be unwise to put them under the HPS during the day like my other vegging plants, or keep them under the 4' flouros all day and stop turning them off? I thought the 1000w HPS might be a little too intense for them, so I'm just wondering what I should look for/at what point most people would consider clones to be "capable" of handling such an amount of light? I'd rather not change up my method by leaving the flouros on all day and wasting more electricity, so what I really just want to know is when it would be optimal to move clones into the 1000w chamber without negatively affecting their growth/possibility of survival?