I have found that by using the spiral CFL's (compact flourescent lights) I am able to cram more lights around and above my pots/plants. My room maybe 9 square feet but I only have 6 square feet of plant space to be concerned with.
I've also noticed that after four weeks of 24/7 (15,000 lumens @ 2-3" away) I can prune enough to clear the way for the CFL's light to get further in and down to the lower grow tips. I prune once a week and they just started week 7. I'll prune once more then top them to keep them at a lower profile and for extra flowers while the lower grow tips catch up with the uppermost part of the plants. If you can arrange the CFL's to get the most lamps with the most lumens then I think with ferts and a fan you might be suprised at what they'll do. What they won't do is burn the leaves and run your electric bill up as much as the weed costs to buy. I like the daylight color Spring Lamps...Buy them at:
www.bulbs.com and
www.buylighting.com ...Home Depot might have the next best thing in a warm white color. The bulb in the pic is 2800 lumens, daylight color, 42 watts (150w incandescent equiv.). Six of these kept at about 2-3" from the plants from sprouting through vegging should do ok. I plan to add three more when they're put to flowering.
Hope this is good advice. It seems to work for me. Phyll