The F10 Fresnel is a glass fresnel lens that increases output up to 10x on Bowens mount LED lights. The Duel Lens Optical System is designed for Light Storm fixtures. Achieve output up to 29,300 Lux @ 3 meters with the LS600d Pro and 15° Spot. Adjust spot-flood beam angle from 15º-45° and focus with the seamless, ergonomic helicoid focusing mechanism. Mount F10 Barn Doors using the metal front ring and accessory slot. Includes durable padded carrying bag.