DirectDrive (Ballast Bypass) compact LED bulbs are an energy efficient, long lasting, CFL bulb replacement for a variety of applications. Keystone’s UL Type B 2-pin & 4-pin LED bulbs provide 50% energy savings when compared to a typical CFL fixture and have 4x the useful life. Operates on 120-277V circuits - rewiring of existing fixture is necessary and must be relabeled. Using a UL Type B ballast bypass design, these DirectDrive 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 50,000 hour lifetime, you won’t need to replace these compact LED bulbs any time soon.