Feit Electric’s 18-watt Direct Replacement (Type A) Non-Dimmable Linear LED Tubes replace F21T5 or T5 fluorescent and LED tubes. They work with most existing electronic ballasts for quick and easy plug-and-play installation, with no rewiring necessary. One 1800-lumen linear tube provides four white light choices for various uses. Choose from Bright White 3000K, Cool White 4000K, Daylight 5000K, or Daylight Deluxe 6500K before installing to have the right light for any job. They’re a bright, reliable choice for many residential or commercial lighting including living rooms, garages, warehouses, offices, workshops, basements, convenience stores, retailers, classrooms, and more. T534/4CCT/LED lights turn on instantly, offering flicker-free full illumination with no warmup time compared to fluorescent tubes. They are mercury-free and shatter-resistant for safe and easy disposal. Lower heat emission extends the life of the tube and ends do not turn black or burn with age. Enjoy lower maintenance costs compared to traditional fluorescent linear lights. Switch to Type A LED linear lights for your space and get up to 50,000 hours of superior light. That's 45.7 years based on 3 hours of daily use.