DirectDrive compact LED bulbs are an energy efficient, long lasting, CFL bulb replacement for a variety of applications. Keystone's UL type B 2-pin LED bulbs provide 50% energy savings when compared to a typical CFL fixture and have 4X the useful life. Using a UL type B ballast bypass design, these DirectDrive 2-pin LED bulbs eliminate the need for an external driver or ballast. By offering a CFL bulb replacement with ballast bypass capabilities, Keystone takes away any guesswork of ballast compatibility. This makes installation quick and easy and with a 50000 hr lifetime, you won't need to replace these compact LED bulbs any time soon.