Planted Tank Enthusiast
Join Date: Apr 2004
Location: Des Moines, Iowa
Get a piece of aluminum, say 3/32" of suitable size and before you bend it it all, start polishing. It really isn't that hard, especially if you have a buffer like you use on cars.
Start with red rubbing compound, then use white polishing compound. for a 2X4 piece it takes about an hour, maybe less.
Aluminum around here though ain't cheap.
I really think it would be wise to look into a pre-made reflector from say AH, I know the urge to DIY is strong but sometimes is just doesn't make much sense.
Personally, I think using a white reflector alters the appearance of the light, in fact I had two floodlights, I replaced the white reflector in one with a piece of aluminum flashing which I polished out of boredom and you tell the difference, but maybe it was brightness, looked like color shift though.