It might not be the light! Just remember seeing something that looked like it.
I primed the car just with normal matt paint from a spray tin, and then rollered the paint on. Remember. THIN coats! Otherwise it goes horrible.
So very thin coats, and just keep rolling and it will come out nice, fill in the small details with a small paintbrush, then rub down any imperfections and re-reroller the car with a final coat. Walah!
Its all about the VT Rep, I do love mine