Hi. I currently have a 400w PL light setup. I was thinking to augment this with a cheapo 400w hps (used, rebuilt, etc. off ebay or inside sun). Certainly the 400w hps systems are affordable. I wonder though - is it better to have (2)-400's or (1)-600? I'm afraid to go with 1,000 as I'd have heat to deal with and wouldn't be able to get the light as close to the plants anyway so it might be counter-productive. My space is about 3.5 or 4x4 feet. Or - hopeing to not have more than 4 plants in waterfarm type containers (kitty litter tubs). What do you guys think? I sort of feel that one 400 hps is making progress slower here and if I could spend another $100 bucks on an extra 400 - they'd grow faster/fatter. But not sure what route to take. I probably should have gotten the 600w pl light but they were crazy expensive.