CLD18SW - CFL Double Turn D Type 18W 3500K G24d-2 2 Pin - Crompton Lamps Ltd
Amazon.com: GoodBulb 18 Watt CFL Light Bulbs | 2 Pin G24D-2 Base 2700K Soft White | 18W High Output 1200 Lumens | Double Tube Compact Fluorescent Light Bulbs Plug-in | 10 Pack : Tools & Home Improvement
E-Simpo G24d to E26/E27 Adapter (NOT GY24d)2 Pin CFL Socket Adapter 21.8mm G24 to E26/E27, GX24d to E26/E27 Lamp Base Converter,Rohs. 2P in Cross, Need Bypass The Ballast! (10-Pack) - Amazon.com
Simply Conserve G24D vertical PL 18-Watt EQ Single tube Cool White G24D-2 Pin Base LED Light Bulb (20-Pack) in the General Purpose Light Bulbs department at Lowes.com