GE Lighting 13576 F7BX/SPX27/CD Compact Fluorescent Bulb 7W CFL REPLACEMENT BULB KW's: flourescent tube biax twin fluorescent compact bulb 7w g23 adaptor adapter Base: GX23; Bulb Type: T4; Watts: 13 Initial Lumens: 825 Guaranteed to last 4 years based on 4 hours use per day at 120V.