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
Compact Fluorescent Bulb PL-C 18W/827/4P/ALTO 4-Pin # 383299 - LED Lighting Space
NaturaLED 18W LED PL Bulb, Direct Line Voltage, 4-Pin, G24q/GX24q Base, 4000K (NaturaLED LED18PL/H/185L/4P/840/IF) | HomElectrical.com
Philips 345017 - PL-L 18W/841/4P Single Tube 4 Pin Base Compact Fluorescent Light Bulb - Walmart.com
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
Philips 18W 4 Pin 2G11 Cool White Long Single Twin Tube CFL Bulb | PL-L 18W/41 (4-Pin) | Bulbs.com
10 x Philips 18W MASTER PL-L 4-Pin - 18W / 2G11 / 840 [4000K] Cool White PLL 8711500706690 | eBay