PM-sulfur burn-in tent

Am going to burn sulfur to help control powdery mildew. Going to do for first week of flowering, then switch to dutch master zone/penetrator spray through flowering. I have not burned sulfur before and don't want to over do it in the tent. ANy suggestions of how much and how long?

I have a growlab 80, 400w radiant(hydrofarm)/eye/lumatek, small elf filter with 4"can fan. Have 2 purple kush and a NL #5.

Did you ever end up burning the sulfur in your tent? I'm facing a similar situation, and there seems to be little information on the web about doing this. Just wondering your experience and conditions, take care.