i dont know shit about growing but form the context it sounds like something used to measure trichromes or something.
Its a small hand held optical device that magnifies objects for getting a up close and personel view.Jewelers use them for gem stones as well as stamp collectors etc.This is a example of a Bausch&Lomb hastings 20x.Very small with exellent optics.
you fer burned them first alot of leaf curling could be too high of heat not light burn perse...but too high of heat for the strain causing full leaf curl what are your temps in the room...light on you need a passive intake and a blower or some time of exhaust to blow the hot air out.... intakes should be low in the cab/closet and the exhaust should be higher....hot aire dose rise... and dont give me some lippy ass response like you have to others....i dont need to hear your bullshit
I have a fan on the plant that blows air out and sucks air in. on the same fan. the fan has to fans on it side by side and an in take and a blower on it.