Light Efficient Design LED-6115-A 120/277 Volt 4-Foot T8 Tube 18-Watt 228-LEDs Acrylic 4200K, Warm White Warm White SW (4100K) Compare to 32-Watt standard fluorescent Up to 50,000 hour lamp life Minimal heat output ETL certified, Lighting Facts (LED-6110/2/4/6)