Rule of thumb.... or hand if you will...
Put your hand above the plant and lower the light until it starts to burn you, then back it off just a bit.... if it burns your skin or is uncomfortable to your hand, it is uncomfortable to the plant....
serpentine5 Reviewed by serpentine5 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