That's why all my wiring was outside the box as you'd notice (I do have an electrical licence).Or use Panda plastic or mylar (foil also conducts electricity so isn't the smartest option either)its relatively cheap get it off ebay or from a hydro shop
I looked around for a larger white box, I'm going to take the lid off a large esky and use that, with one CFL instead and not cover the top, to let heat escape.