Mylar (reflective material) you can find in the camping section of WalMart. It's around $2.50 for a large section. I forget the spects but I believe it's about 6x6.

Wal-Mart and Lowes/Home Depot have the light brackets. I bought one today for $2 that holds 3 at the thrift store.

I also bought a few "drop lights" that have the metalic dome around them and a long extension chord on the end.

I'm working on my closet too.