Ya gotta keep 4-footers RIGHT on top of the plants, so as long as they are small you could fit a bunch - I use a 2-bulb 4-footer for clones from rooting til about 2 weeks and could fit ~ 20+ under there easy.
But when it comes time for flowering they simply wont have enough penetration to do much beneath the top layer, and you'll need better lights
Tokudai Reviewed by Tokudai on . Lights I have two garage light the 4ft flouros two bulbs each in a 5x6 room and i waswondering how many plant do you think those light will be able to grow in that room i just bought some bubble gum seeds and i hopping i could go indoor this year the other time i went outdoors so if you could help thanks!!! Rating: 5