Whats the best thing to use for reflective light?

a white surface is just as good. paint the walls white or buy some foam board at an art store or drug store. whatever you do, do not use aluminum foil, the crinkles cause light to reflect unevenly and can cause hot spots and burn your plants
 
You can use those heat/survival blankets that they sell at camping stores.. They are made of mylar & they are cheap too
 
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