I'm looking in setting up a little hidroponic setup for emersed growth. The system I'm looking to use is a flood and drain system with rockwool as the medium. Having some enclosure above over the plants to keep humidity up. Been doing allot of reading and can't find a good answer. I decided on using t8 tubes and looking the grolux way with some decent reflectors. Because it's a emersed setup the look of the lights don't bother me. Looking for good steady growth not looks. Now for the question w/m2? lights will be about 400 to 450 from the substrate with a class sheet under the lights.