Lite Source 12 Watt 120 Volt Circular Tube Compact Fluorescent Bulb - Amazon.com
Project 'Green' House #1: LED replacement lighting for circular fluorescent tubes // DavidJB.com // Python, Technology, Web, Linux, and more, by David Beitey
SUNLITE 14in White Round Plastic Cover for AM32 Circline Fluorescent F – BulbAmerica
4 Easy Ways to Change a Circular Fluorescent Light Bulb - wikiHow
NEW Porcelain Matte White LED Bulbs Modern Lighting Dimmable 4W E26 G200 G125 G80 G40 G25 A19 120V - Etsy
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
TCP 150W Equivalent, CFL T6 Double Circle Lamp, Non-dimmable, Soft White - Indoor Figurine Lamps - Amazon.com