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
4 Easy Ways to Change a Circular Fluorescent Light Bulb - wikiHow
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
Plug & Play 16 Inch T9 Circline LED Bulb Ballast Required!
T9 LED Circline Light Bulb, 8 Inch 1600LM LED Circular Light, 13W Clear Cover 6000K Daylight Replacement for FC8T9/CW 22-Watt Fluorescent Circular Bulb(FC8T9/CW), Ballast Bypass Required - Amazon.com
Project 'Green' House #1: LED replacement lighting for circular fluorescent tubes // DavidJB.com // Python, Technology, Web, Linux, and more, by David Beitey