Bulb Daddy's 4ft plug & play integrated EBBU (Emergency Battery Back-Up) LED T8 tube is the best solution for users looking for LED emergency lighting. This 18 Watt multi-functional LED emergency lamp offers users both the convenience of normal, everyday lighting along with the safety provided by emergency backup lighting. The soft white 4000K light gives users peace of mind through 90 minutes of emergency operation on 3W of emergency power. It features the ease of plug and play installation along with an integrated test button and indicator lamps on one end so the tube meets fire protection standards. With a built-in battery and power supply, this emergency T8 tube is a cost-effective and energy efficient option for various applications that require emergency lighting such as office buildings, schools, hotels, apartment buildings, corridors, and stairwells. Plus, the backup battery has both over-charging and over-discharging protection built-in to ensure it lasts an average of 50,000 life hours.