new grower question

[polskatrawa]

thank's for the advice :thumbsup:
i just bought 400 HPS with MH conversion bulb :dance:
i think i got it pretty cheap at insidesun.com (are they reliable?, hopefully)
i will transplant the plants when it comes in
will try to make some pics so you can all see it

I just received my package from insidesun.com it only took them 6 days to come in (with the holidys)i am soooo sight. :dance: :dance: 400 HID both MH and HPS
well i hung it 20 inches above the plants which are now about 4.5 inches high with the fifth set of leaves :thumbsup:
is that high enough or they should be lowered?? or raised up ?
i've heard 24 inches above the plants is good but iam not sure
i have the fan blowing inbetween the plants and the light for cooling and air movement
hopefully some pics tomorrow

[LOC NAR1958]

Hold your hand just above your plants and lower the light untill your hand gets hot. You can lower a little at a time. If you can hold your hand there for a minute and not burn then that's it. For every inch too far away wastes lights lumens and that is where the power is at.