Ive seen people use reflectors, paint, and/or plastic. Im growing in a small box 1 1/2ft x 2 1/2ft x 3 1/2 and Id like to know which would be the best to coat the inside with. Thanks
You can buy mylar, or you can use emergency blankets. I found emergency blankets at Target for cheap, it measured 53 inches by 82 inches. 1 should be enough to line 5 growboxes
Out of curiosity, have you noticed any increase in temperatures since you installed the emergency blanket? They claim to 'reflect body heat'.