Fulight Easy-Installing &curren; F13T5/CW LED Tube Light - 21" Inch 6W (13W Equivalent), Cool White 4000K, Double-End Powered, Frosted Cover- 110/120VAC MUST be directly wired to the 120V AC Power: Disconnect Ballast & Starter if there is any! Installation Manual is attached as the 2nd photo at the left upper corner of this product page! ***DON'T BUY UNLESS YOU UNDERSTAND THIS!*** Instant-On Cool White 4000K to replace 120V standard 21" F13T5 CFLs Rotatable: light forwarding angle can be adjusted by +-90 degrees to fit any light fixture! GREEN ECO FRIENDLY + SIGNIFICANT ENERGY SAVING: no flickering, no UV light, no buzzing ballast, no hazardous materials + Saving ~50% electricity Lifetime&gt;50,000hrs; 3-Year Warranty.