As close as you can get them. Flouros generally will not burn your plants. Assuming you're using a cool white bulb (or tube) you will have no problem. You want them just barely above the top, takes a lot of adjusting sometimes as they grow quickly. As for wiping down the leaves, I don't think I'd do that as the plant starts flowering, you really just want to leave them alone as much as you can. The less fussing you can do with the plant the better. the leaves will develope a somewhat fine "fuzz" you can see with a magnifying glass,(Probably better not to disturb a natural process). Also the leaves will start developing trichomes and you definately don't want to wipe these away!
kuulbns Reviewed by kuulbns on . Fluoro Burning How close can the Fluoro be to burn the plant? Rating: 5