how far?

[not_a_clue]

ive got a 400watt mh light,grow room is 4" x 2" 6" in height plants 1 week old how far from the top shud the light be from the plants?

 

[Dubbaman]

for seedlings IMO keep that light about a foot off the tops of them much closer and you might fry them.

 

[Fretless]

grow room is 4" x 2" 6" in height

Have you see the movie "Spinal Tap"?