similar to what serpentine said, but you should be able to hold your hand at the top of the plant for approximately 5 seconds before having to move it because of heat.

-shake
headshake Reviewed by headshake on . Light Distance/Height? Hello everyone! I've been browsing the posts for a while, and although its mentioned here and there, I havent found a "guide" if you will. If there is one, point me in the way, and i'll happily read away. As for the question: Is there a general rule of thumb for light distance from the plants? I know different stages require different heights, just curious what works for everyone else. My setup is fairly small, 400w MH for veg, 400w HPS for flower. Attached are a few pics just Rating: 5