Lights are on when I’m awake but I do have a timer on the way. Johnny’s recommends 3-6” for the lights that they sell and mine are comparable in output to theirs. They’re LED so they don’t put out much of any heat. Just lowered to 4” and I also have a tin foil tent over them to reflect more light onto the plants.
“I also have a tin foil tent over them to reflect more light onto the plants.”
LOL! I learned that trick from the College-age dopers that were growing pot in their door room closets, under lights. ;)