Color & Wattage Adjustable - Our 4ft led tube light offers you the option of choosing your color temperature and wattage, which offer 15 watts, 18 watts, and 20 watts of power, and 3500K/4000K/5000K to choose the color temperature you want. Install With or Without a Ballast-These tubes can be ballast mounted (plug and play) or without ballast mounted (direct mounted). Please check ballast compatibility before purchase. Standard international 4' T8 tube. Replace traditional fluorescent tubes. Long Life-It has an astonishing 50,000 hours of service life, which means it won't need to be replaced for another 5 years.