If you're not using Panasonic Fluorescent bulbs you should be.
Here's a chart that makes it easy to switch. The Panasonic bulb
in the left column corresponds to your old bulb on the right.

QUAD-TUBE COMPACT FLUORESCENT LAMPS/2 PIN Panasonic Philips General Electric Osram/Sylvania FDL22LE/D FDL22EX/D FDL28LE/D FDL28EX/D FDS13E27.U/2 FQ13E27.U/2 FDS13E41.U/2 FQ13E41.U/2 FDS18E27/2 FQ18E27/2 FDS18E41/2 FQ18E41/2 PL-C15mm/22W/27 PL-C 15mm/22W/50 PL-C15mm/28W/27 PL-C 15mm/28W/5 PL-C13W/27/USA PL-C13W/27/USA PL-C13W/41/USA PL-C13W/41/USA PL-C18W/27 PL-C18W/27 PL-C18W/41 PL-C18W/41 - - - - F13DBX23T4/SPX27 F13DBX23T4/SPX27 F13DBX23T4/SPX41 F13DBX23T4/SPX41 F18DBXT4/SPX27 F18DBXT4/SPX27 F18DBXT4.SPX41 F18DBXT4.SPX41 - - - - CF13DD/827 CF13DD/827 CF13DD/841 CF13DD/841 CF18DD/827 CF18DD/827 CF18DD/841 CF18DD/841 QUAD-TUBE COMPACT FLUORESCENT LAMPS/4 PIN Panasonic Philips General Electric Osram/Sylvania FDS10E27/4 FDS10E41/4 FDS13E27/4 FDS13E41/4 FDS18E27/4 FDS18E41/4 FDS26E27/2 FDS26E41/2 - - PL-C13W/27/4P PL-C18W/41/4P PL-C18W/27/4P PL-C18W/41/4P PL-C26W/27 PL-C26W/41 F10-DBX/SPX27/4P F10-DBX/SPX41/4P F13DBX/SPX27/4P F13DBX/SPX41/4P F18DBX/SPX27/4P F18DBX/SPX41/4P F26DBXT4/SPX27 F26DBXT4/SPX41 CF10DD/E/827 CF10DD/E/841 CF13DD/E/827 CF13DD/E/841 CF18DD/E/827 CF18DD/E/841 CF26DD/827 CF26DD/841 PANASONIC CIRCLE-6 COMPACT FLUORESCENT LAMPS/4PIN Panasonic Philips General Electric Osram/Sylvania FHT18E27 FHT18E35 FHT18E41 FHT26E27 FHT26E35 FHT26E41 FHT32E27 FHT32E35 FHT32E41 F40EX30(T10) F40EX41(T10) F40EX50(T10) - PL-T18W/35/4P PL-T18W/41/4P - PL-T26W/35/4P PL-T26W/41/4P - PL-T32W/35/4P PL-T32W/41/4P - - - F18TBX/SPX27/4P F18TBX/SPX35/4P F18TBX/SPX41/4P F26TBX/SPX27/4P F26TBX/SPX35/4P F26TBX/SPX41/4P F32TBX/SPX27/4P F32TBX/SPX35/4P F32TBX/SPX41/4P - - - CF18D T/E/827 CF18D T/E/835 CF18D T/E/841 CF26D T/E/827 CF26D T/E/835 CF26D T/E/841 CF32D T/E/827 CF32D T/E/835 CF32D T/E/841 - - - *Panasonic FQ Quick Start Series offers the additional value of a one second starting time by incorporating Panasonic's instant starter chip technology at nominal temperature range (14°F - 122°F/minus 10°C - 50°C).   Specifications subject to change without notice.