About 20 inches is as close as I wanna get, 24 is what I shoot for. I do have REALLY good air circulation between the lights and the canopy. Any closer and I get chlorosis (bleaching) even if I keep them cool enough to not burn. The tallest buds in these photos are about 20 inches from the light. Thos few buds that are leaning over were a little closer before they started to lean, maybe 17 inches. lol
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If you can't get really good airflow between the lights and buds then you will want more distance.
You can be too close and not burning them, so it's not just about burning them. I don't know why you are being so mean to this guy.
Smoke a bowl and lighten up (pun intended).