10 / Carton. T8 LED tube illuminates rooms with 1,800 lumens of cool, white light using just 15 watts of energy. Highly efficient, LED bulb delivers long-lasting performance for up to 50,000 hours. 120-volt bulb is 48" in length and has an 82 CRI. All-glass tube does not require a ballast or external driver. LED bulb with a medium bi-pin base is designed for use only in non-shunted lamp holders.