M mark pearce Well-Known Member May 14, 2009 #1 at wot height shud i hav my 400w mh above my seedlings
lozac123 Well-Known Member May 14, 2009 #2 put ur had at the level of the plants, and lower the lamp till it feels slightly warm, thats a perfect height.
put ur had at the level of the plants, and lower the lamp till it feels slightly warm, thats a perfect height.
keico Well-Known Member May 14, 2009 #3 mark pearce said: at wot height shud i hav my 400w mh above my seedlings Click to expand... If you have a cool tube you can get them very close. Rule of thumb as is stated earlier. Place your hand on top of plant, if it is too hot for your hand then it is too hot for the plants. A safe distance would be about 12 inches
mark pearce said: at wot height shud i hav my 400w mh above my seedlings Click to expand... If you have a cool tube you can get them very close. Rule of thumb as is stated earlier. Place your hand on top of plant, if it is too hot for your hand then it is too hot for the plants. A safe distance would be about 12 inches