KOR (Pack of 4) 13 Watt Double Tube - G24Q-1 (4 PIN) Base - 4100K Cool White - CFL Light Bulb. Replaces Sylvania 20667 CF13DD/E/841 - Philips 38328-1 PL-C 13W/841/4P/ALTO and GE 97597 F13DBX/841/ECO4P - Amazon.com
Feit Electric 32W Equivalent PL CFLNI Triple Tube 4-Pin GX24Q-3 Base Compact Fluorescent CFL Light Bulb, Bright White 3500K (1-Bulb) BPPLT32E/35/HDRP - The Home Depot
Philips 24W 4 Pin 2G11 Neutral White Long Single Twin Tube CFL Bulb - Walmart.com