Mylar Film creates increased reflectivity compared to other foils and films. 95% block out from natural light and heat! All indoor gardens that use artificial light should use a reflective film to increase growth. Your plants will mature faster and it will make your plants bigger and stronger. Use your Mylar film to hang around your garden — even cover the floor and the ceiling to reflect your light up and down. Make sure you keep them at least 6” away from your plants.