2 Pack 4 Foot T8 LED Tube Light 18W , 5000K (Daylight), 2160 Lumens (120 Lm/W), Single End Power, UL Listed, DLC Listed Pack of 2, 48 in T8 18W UL & DLC Approved. Very High Efficiency Output (145 Lumen Per Watt), 5000K day light bulb No Ballast Needed. Easy to Install. International standard shape for T8, T12, T10 tube light. Easily fitted instead of traditional fluorescent tube lamps. environmentally friendly. No buzzing ballasts. No mercury or hazardous material 5 Year Warranty. If the product is defective within 5 years, please contact us and we will give you a good solution.