PacLights Tube40 T8 48'' 4ft LED Tube Light Bulb 18-watt, Cool White, Frosted Cover, UL Listed, 45w Fluorescent Equivalent Replacement (1820 lumens) Save 60% Energy by this 45w Fluorescent Equivalent 18w T8 LED Tube. Milky Diffuse Cover for Comfortable Output (1820 Lumens), at Cool White (6500k). No Brightness Degradation; Over 50,000 Hours Lifespan; Maintenance Free. UL Listed, Quality Ensured; High Efficiency - over 100 lumens per watt No Ballast Needed; Instant On, Instant Off; Environment Friendly.