Oh god please don't, first off, hold a match cigarette anything hot up to a piece of foil! This stuff is flamible expose this stuff to a electric cord really do it! Bet you won't wan't that in your grow. better to get some plywood. make a box. Paint it flat white not gloss, "flat" cheap white paint. If you where to hold a lumen meter close to the white wall, you will find it has beter light reflecting qualities than "type 1 maylar". at 99 percent. Alunimum doesn't have great reflective qualities. It does have great magnifing qualities that is why it burns your leafs. Don't use it. Cheap mylar sheets 8foot by 4foot can be purchased at wall mart camping section. Look for those reflective emergency blankets cost$2.00. Once again very flamible! You want to keep water from electricity and electricity insulated agianst anything flamible. Look for Ideas to do this CORRECTLY. doing it on a shoe- string is good. But do it safe as well. It is very common for growers to burn themselfs down. This is a fire you won't wan't to explain to the fire marshal and detective. believe me, listen to the voice of experience!!!