I'd really try and keep all sources of ignition away from the inside of that booth. Put the light on the outside of the booth perhaps behind you, or cut a hole in the top and replace with plexiglass and put the light on top of that. Also...... I'd invest in a shop vac to take that powder away and not the bathroom fan. Not only for sake of powder clogging up the fan or hitting the electricals of the motor, but where would the powder go if you did that? Just "away"? Away to where? If it lingers around in your shop because you just pushed it from one area to another.... EVERYTHING is going to have powder all over it. Not to mention, you're going to breathe that stuff in and so are your buddies when they keep hanging around watching what you're doing. Nope.... I truly suggest sucking it into a filtered system and disposing of it that way. Even if you just pull it away from you and outside..... your neighbors won't be too happy with you. Houses and cars will turn blues and greens, the dog will have a tint to him.... it's gonna be a mess,lol. Eventually that cop is gonna be called and I highly doubt you'll coat your way out of that one