LED Replacement Lamp for 2 Pin CFL 500 lumens works in GX23 bases.With the Topstar LED lamp, you can easily replace a 13-watt CFL lamp without the need to bypass the ballast or you can use it directly on 120-277V if you would like to bypass the magnetic ballast. 180 degree rotatable base. TOPSTAR PLS lamp has been designed and engineered for demanding commercial applications. This hybrid installation lamp can work with a magnetic CFL ballast or run off line voltage. This lamp replaces 7W & 9W and 13W CFLs. The base of the lamp can be rotated 180° to fit any socket configuration. Simply install in your existing fixture and turn ON the savings.