That dimming light might work fine - I've never used one so I can't comment on it. I use HO T5 fluorescent lighting for my clones from the first day they are cut until I start them on 12/12 for flowering. This saves on heat generated and the plants seem to veg out just fine - just have to make sure there is plenty of light so the plants do not stretch looking for more light. For flowering I use a 400w HPS light except in summer when its too hot to keep things cool - then I use the T5 lights. Yield is down some but thats to be expected. And in case you don't know you can use the HPS light for vegging if you like. I have a switchable ballast light system with MH and HPS. I see little difference except that (from what I've read) the HPS is a bit more efficient for the given amount of light produced and produces a bit less heat. While the HPS light does get quite hot I've noticed the MH light seems to get hotter.

I also use the same size grow tent as you do. There isn't enough light with a 400w light to fill the tent completely - something I knew when I bought it. I also knew I'd have to make room for a 560cfm fan and the ducting it requires - which is why the larger tent. The light seems to cover a 3x4' area pretty well.
blunt lover Reviewed by blunt lover on . Any advice for my first grow? I'm currently planning for my first grow in the next week or so. I ordered an 400 watt dimmable grow tent set. My tent is 60x60x78. Is this tent too big for a 400 watt light? I am planning to grow six auto plants. I got a northern light variety. Is 6 plants too much for my 400 watt light? Could I do more than six? I have read that these plants tend to be smaller and do not require very strong light to thrive. I am gonna do a 16 an 8 light cycle. Any feedback would be appreciated. Rating: 5