Reusable T-8 and T-12 UV Filter Tubes encase existing fluorescent lamps and filter UV radiation up to 385nm when used with 400 M.A. lamps. Insulates and improves lighting efficiency at low temperatures. High tensile polycarbonate protects people and equipment from lamp shattering. Furnished with end caps that fit snugly between lamp and sleeve. Release channel allows gases to disperse slowly into the atmosphere. Perfect for laboratories, museums, galleries and other areas where UV light can deteriorate materials.