Maximize your light utilization, and ensure your plants receive the most light they can. With alternate sides, this thick, durable 6 mil film can be used throughout your indoor garden. Our white side reflects over 95% of the light back to the canopy, while the black surface prevents light penetration, and can be used to partition indoor gardens. Our heavy-duty waterproof film also helps prevent algae and mold growth on walls, floors and ceilings.