Feit Electric 22-Watt 8 in. T9 G10q Linear Circline Fluorescent Tube Light Bulb, Warm White 3000K (12-pack) FC8T9/WW/12 - The Home Depot
Circline | F_FCIR | Philips lighting
Project 'Green' House #1: LED replacement lighting for circular fluorescent tubes // DavidJB.com // Python, Technology, Web, Linux, and more, by David Beitey