bout 24 inches away!!!! just never had a hps light b4 and really didn`t know how fierce they can be!!! - learnt my lesson now and getting to grips with it all now! i think i put them seeds to germinate a bit too soon!! Should have read more b4 really!! classic case of trying to run b4 i could walk but i`m learning fast now thanks to some class people on here!!! Thanku all!!