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 13-Watt PL CFLNI Quad Tube 4-Pin Plug-in G24Q-1 Base Compact Fluorescent CFL Light Bulb, Soft White 2700K (1-Bulb) BPPLD13E/HDRP - The Home Depot
Feit Electric 13-Watt Equivalent PL Quad Tube CFLNI 4-Pin Plugin G24Q-1 Base CFL Replacement LED Light Bulb, Cool White 4100K (1-Bulb) BPPLD13E841LEDG2HDRP - The Home Depot