It features top quality double thick Mylar with a 99% efficient reflective surface. The tents collect and then reflect any light emitted outside of the canopy footprint and delivers it directly back to the plant. These tents are designed to reflect the spectrum’s provided by Mars Hydro LED grow lights and other HID grow lights. HID Grow lights such as Metal Halide (MH) and High Pressure Sodium (HPS) lamps can also be used in this grow tent. This special surface easily outperforms any other grow tents available. The Mars Grow Tents are one of the first LED engineered Grow tent specifically for growing with Mars Hydro products.