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Hard to tell from the pic, but from personal experience, clones are much more fragile than seedlings of the same size. You'll have to play it by ear and watch for any signs of burning.
I think you're probably at around a good height for now, if they're not showing any signs of burns that is. Slowly lower during a week or so.
You'll simply have to keep monitoring them and raise the lamp quickly if they begin protesting.

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faithless Reviewed by faithless on . Clones and Growns hey, well I've posted a few threads relating these various topics but i come armed with (albeit) shitty pictures. So ive got two chambers, a veg/mother chamber with a 400 MH and a cooltube. No ventilation or heating problems with that baby. However, the flowering chamber is much bigger, about 1.5 times the size running a 1000 W HPS and 15 grapefruit clones. There is a large house fan for moving air inside teh chamber, about a 95 cfm fan doing air in, a 130 cfm fan that connects to the Rating: 5