Has anyone actually seen a hot spot or is it all hear say? I may quite possibly be the shittiest grower here, but I did take a lot of physics classes, and it just doesn't make sense. In order for the light to be get concentrated, there needs to be a smooth, uniformly CURVED piece of aluminum foil to form a focus point. Unless you're trying to, I don't see how you could. Not to mention, the aluminum foil will not be reflecting the main source of light, instead it reflects the radiant light back towards the plant.No
Creates hot spots
Paint your walls white, buy some mylar or poly