You want approximately 50 watts/sq.ft. and you have 15 sq.ft., so 750 watts if you use the entire area. That would mean 2 - 400 watt lights. The lights all have a certain effective "footprint" - the optimum size area you can light with any given lamp & reflector. Dealers exaggerate the effective footprint of their lights/reflectors by up to 50%, so you can't really believe their propaganda.

PC :smokin: