Reflect light for maximum growth All of our high quality reflective sheeting is British Made and will maximise the use of the light in your growroom. Also used to cover floors walls and ceilings! MegaLux MegaShield is a black and silver zero thermal radiation reflective polypropylene sheet that works in a similar way to ADF film but is more advanced. It is infused with metals that give it special properties that are highly reflective completely light tight and stops infrared heat from being emitted bouncing it back into the room. Ideal if you need to keep control of your growing environment.