LED PL Retrofit Lamp for 2 or 4 Pin CFL Bulbs - Replaces 13-18 Watt- G24d / GX24d & G24q / GX24q Base Lamps - Magnetic Ballast Compatible or Bypass, 4000K and 560 Lumens
Viribright Lighting PL lamps 18-Watt EQ Single tube Cool White G24d-2 Pin Base LED Light Bulb in the General Purpose LED Light Bulbs department at Lowes.com
Simply Conserve 18-Watt Equivalent CFLNI Horizontal G24Q PL LED Light Bulb in Cool White (20-Pack) L12PL40G24QH - The Home Depot
Feit Electric 13W/18W/26W Equivalent PL Horizontal 4-Pin Universal Base G24Q/GX24Q-1/-2/-3 CCT Select(2700K/3500K/4100K)LED Light Bulb PL26A/H/CCT/LED/HDRP - The Home Depot