Capable of replacing your existing fluorescent T8 lamps without any additional wiring, the GCP 558 T8 LED tube lamp provides exceptional LED lighting with reduced energy and maintenance costs. Measuring four feet in length and operating at 22 watts, this lamp has a cool white color temperature of 4100K, a rated lifetime of 50,000 hours and a brilliant lumen output of 2200. Built with an internal driver designed to work with your existing instant start fluorescent ballast, this T8 LED lamp functions with a voltage range between 110 and 277 volts. Operating with the pre-installed fluorescent ballast means this lamp is dimmable if the instant start ballast is also dimmable. Installation has never been simpler and does not require a licensed electrician since the lamp requires no special changes and can be swapped or combined with your existing fluorescents. No rewiring allows the fixture to maintain its original UL compliance.