The high brightness PL9 BIP bulb uses only 9W compared to a 18W traditional fluorescent light source. The 2-pin (GX24d) or 4-pin (GX24q) base fits into G24 size fixture socket. The body can be rotated and installed without removing the original fluorescent ballast. It’s integration with the aluminum backed heat sink provides high performance, energy saving, and long lasting light output.