of the cab and you keep the room cool that the cab is in, you should hopefully be able to stay sub 90. Probably have to keep the ballast outside of the cab, tho. If your doing hydro, you might have to take measures to keep the water temp sub 78.

Start at a foot away and move in with the light, and use the back of the hand method - if you don't want to leave your hand there, you don't want to leave your plants there. If you blow a fan between the light and plants it will help get it closer.

400 is probably about as big as you want to go in a cab/closet type setup.

:thumbsup: