Bulbmaster FC12T9/CW 32 Watts 12 Inch Round T9 Fluorescent Circular Light Bulb, Cool White 4100K, FC12T9 1930 Lumens G10Q 4-Pin Base 32W Circline Ceiling Lights - Amazon.com
22 Watt Fluorescent T9 Circline 8 In. Light Bulb with 4 Pin (G10Q) Base, 6500K - FC8T9/
Project 'Green' House #1: LED replacement lighting for circular fluorescent tubes // DavidJB.com // Python, Technology, Web, Linux, and more, by David Beitey
GEL33774 Circular GE Fluorescent Light Bulbs | OnTimeSupplies.com
GE Warm White 4-pin Circline Fluorescent Light Bulb in the Tube Light Bulbs department at Lowes.com
AMATRON ETL Listed 16" T9 24W LED Circline Bulb LED Circular Tube 5000K Daylight Frosted Lens with Non-Dimmable External Power Driver to Replace 16 inch 40W Fluorescent Circline - Led Household Light