***This Is Not a Plug-and-Play Type***: You must disconnect ballast and do fixture rewiring if you had fluorescent bulb in your fixture. The installation manual is attached as the 2nd photo at the left upper corner of this product page. Please review it before buying.
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>50,000hrs; 3-Year Warranty.