Replace any T8 or T12 fluorescent lamp with this Feit Electric 18.5-Watt T8 4 ft. Switching to this bulb is easy and convenient - no replacing or rewiring of lamp holders required, no replacement of the ballast or installation of LED driver required, and no removal of the old ballast required. Included are 2 quick connect wire nuts for easy wiring. This bulb can be used in 100 - 277-Volt and is ideal for both residential and commercial applications. All of our LEDs tubes come with a full 5 year guaranteed and are certified by UL and 100% mercury free.