I wouldn't recommend putting wood near a hot light (unless its like a CFL). I found a decently cheap way to make a home-made reflector. All you need to do is go to home-depot and get some aluminum sheet metal. They come in like 8 foot rolls. One side is white the other is either black or brown. If you wanna be really cheap you can just cut the sheet (it will bend like a rounded reflector naturally) and use the white side. Otherwise I would recommend coating it with foylon or mylar.

~8$ for sheet metal.
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