You can use duct board. It's insulated on one side and and silver backing on the other.Comes in a 4x8 sheet and can be used to make reflectors for HID lights as well.Figure your design out and cut peices then use the foil ducting tapeto tape the peices together.You could make more than 1 from this sheet. That backing will really throw the light back at the plants. A mind is a terrible thing to waste! Don't waste ya mind,GET WASTED!

Ga Grown!
GaGrown Reviewed by GaGrown on . Making cheap reflectors?!? I've got a CFL grow setup that just finished up round 1. I'm very pleased with my setup but wanted to add a light reflector to max. my light use. I've looked around, and basically I need two cone reflectors, or perhaps a built in single. I've been looking at the hydro store, and also the depot, and just found these on ritz camera, and was wondering if anyone had tried this or something else for a cheap reflector setup.... Photoflex LiteDisc Reflector White/Silver Reversible 22-inch - Rating: 5