Safety sleeve. Slips easily over fluorescent tubes to retain shattering glass and phosphors if tubes break, fall, or burst. A safety cap on each end of the sleeve helps ensure a snug fit. Colored sleeves can mark exits, fire extinguishers, safety zones, etc. When used outdoors, or in low-temperature indoor applications, sleeves maintain a warm air zone around the lamp for more effective, more efficient lighting. Not designed for use with high-output lamps. Use in food processing plants, bakeries, dairies, schools, warehouses, factories, restaurants, and stores.