hey i'm planning on growing 2-3 plants with a 400w mh bulb for vegging. Approx. how far away should the plants be form the light as to not burn them? thank you
Test the light with your hand a certain distance away and if its too hot/uncomfortable then it will be too hot for your plants too.
This. I run a 400w light sometimes as close as 4 inches from the plant though. If you're in a confined area, such as a closet, you should think of cooling the light w/ a coolable reflector and an inline fan. Mo light = Mo betta