GE Biax D ECO 26W 4 Pin Compact Flourescent Lamp Bulb (5 Pack) F26DBX/835/ECO4P, Fully compatible with: PL-C 26W/835/4P, CCF26DD/E/835, F26DBX/SPX35/4P Fully Compatible with GE F26DBX/835/ECO4P Fully Compatible with Phillips PL-C 26W/835/4P Fully Compatible with GE F26DBX/SPX35/4P (Older code) Fully Compatible with SYLVANIA CCF26DD/E/835