Philips Advance ICF2S26M1BS35M (2) 26 Watt CFQ26W/G24Q Lamp Electronic Fluorescent Ballast 120 - 277 Volt SmartMate Compact Fluorescent 120/277V M1: Metal Case BS: Bottom mounting studs with single entry color-coded connectors Advance's SmartMate electronic ballasts operate 4-pin compact fluorescent lamps for many of the common quad and triple tube CFLs and long twin-tube lamps.