Please note:150x150x200 is out off stock for UK buyer Mars Hydro tent blocks all light from escaping. Nylon explosion-proof zippers & double stitching and double-channel port housing to protect against light leaks. A detachable mylar bottom shell and a 95% light-proof, tear-resistant, reflective mylar lining increase the intensity of the lamps and retain heat to keep the tent at the right temperature for plants, flowers, fruits and vegetables. Mars Hydro grow tents use 1680D thick canvas, heavy-duty steel poles, and SBS zippers, creating a non-toxic human work environment while using high-quality materials and locking all light in. Easy observation view window, removable floor tray, and a tool bag to help grow the plants indoors more conveniently.