painting

Hi! I am in possession of a bunch of white LED wash pars, all of which will be visible in the next production. What is the best way to paint them black? Since they are LED's will they need a high temp paint? Preferably a spray paint.Thanks in advance!

Does anyone have a good online source to buy inexpensive paint brushes, also know as chip brushes? We don't buy really good brushes because this is a high school. I usually get them at McMaster-Carr but I wonder if there is somewhere cheaper?