Designed to plug into existing 54 W T5HO ballasts without re-wiring, 27 Watt DirectFit T5 Lamps enable upgrade to energy-efficient LED technology. Replacement lamps are suitable for use in totally enclosed, bi-pin socketed luminaires, and evenly distribute more than 3,100 lumens for general commercial and industrial lighting applications. Constructed of glass with shatter-resistant coating, units are available in color temperatures of 4,000 and 5,000 K and are rated for 50,000 hours.