4 foot LED T8 Retrofit Kit 18W, Commercial Grade, UL Listed, 3 Year Warranty - Daylight White UL Certified - The best components are used to ensure at least 50,000 hours of performance Trusted by top hotels, office buildings, schools, hospitals, and other facilities Proprietary chip and driver provide over 1900 lumens in four colors - Natural, Warm, Day, and Cool Average 58% energy savings vs fluorecents - applicable for tax breaks and utility company rebates Internal power and clear instructions for a safe and easy replacement of fluorescents