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 16.5W 4000K 4 Pin Single Twin Tube PLL LED Bulb, Ballast Compatible | 16.5PL-L/PER/22/840/IF22/P 4P | Bulbs.com
Converting to LED PL Lamps Couldn't Be Easier - Culture Lighting | Indianapolis, Indiana