Choosing the best wall covering for your indoor grow room can make a significant difference in the yield you get. If you’re on a budget, painting the walls of your indoor grower with flat or matte white paint can help reflect the light without creating any unnecessary hot spots.
If you have a little more to spend, consider lining your indoor grow room with Mylar. Developed by NASA, Mylar is a synthetic and reflective covering designed to reflect between 90% to 98% of your indoor light source. That being said, Mylar can pick up dirt, which decreases its ability to reflect light.