11-Watt T5F 4-Pin Base | Replacement UV Light | The Pond Guy
PL7/41K/2G7 4 PIN SUPRA LIFE COMPACT FLUORESCENT LIGHT BULB – Bulborama
GE Plug-In LED 12-Watt EQ Bright White GX24Q-4 Pin Base LED Light Bulb in the Specialty Light Bulbs department at Lowes.com
ASL Spiral 18W 4 Pin Light Bulb, SC18/E/2700K CRI 82 Warm White #G24q-2 Lot Of 2 | eBay
Philips 18W 4 Pin G24q2 Very Warm White Double Twin Tube CFL Bulb | PL-C 18W/827/4P/ALTO (4 Pin) | Bulbs.com
FML65/65K/GX10Q-4/4 PIN SUPRA LIFE COMPACT FLUORESCENT LIGHT BULB – Bulborama
Feit Electric 13-Watt Equivalent PL CFLNI Quad Tube 4-Pin G24Q-1 Base Compact Fluorescent CFL Light Bulb, Cool White 4100K (1-Bulb) BPPLD13E/41/HDRP - The Home Depot
Simply Conserve G24Q/GX24Q Vertical PL 18-Watt EQ Single tube Daylight GX24Q-4 Pin Base LED Light Bulb (4-Pack) in the General Purpose Light Bulbs department at Lowes.com