MCGILL® Reusable protect-o-sleeves for T-12 diameter lamps. It insulates fluorescent lamps to improve lighting efficiency at low temperatures. High tensile, polycarbonate strength protects people, equipment and products. It is used for applications requiring ultra-violet light filtering such as museums, department stores and art galleries, where fluorescent lighting can deteriorate materials. Furnished with end caps that fit snugly between lamp and sleeve. Insulates lamps up to 2.5 times at -6 to 38° celsius.