Philips 32-Watt 12 in. T9 Circline Linear Fluorescent Tube Light Bulb, Daylight Deluxe (6500K) 262600 - The Home Depot
Energy Saver (CFL) Circular Cool White 40W Light Bulb | Homebase
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
Project 'Green' House #1: LED replacement lighting for circular fluorescent tubes // DavidJB.com // Python, Technology, Web, Linux, and more, by David Beitey