Ditto.. I have 2- 1000w lamps at 18 inches away. Never burned my plants but I pump up my fan for 5-10 mins right after spraying. Never had any burns.
Damn fungus gnats... I only see 1 or 2 but they keep popping up here and there so I need to start spraying again. I add pyrethrins to my mix.

Peace and love, -Jay