Philips 18W 4 Pin G24q2 Very Warm White Double Twin Tube CFL Bulb | PL-C 18W/827/4P/ALTO (4 Pin) | Bulbs.com
Utilitech 4-Pack 18-Watt (75 W Equivalent) Spiral Medium Base Daylight (5000K) CFL Bulbs ENERGY STAR at Lowes.com
Satco S7225 18-Watt Medium Base T2 Mini Spiral, 4100K, 120V, Equivalent to 75-Watt Incandescent Lamp for Enclosed Fixtures - Incandescent Bulbs - Amazon.com