22 Watt Fluorescent T9 Circline 8 In. Light Bulb with 4 Pin (G10Q) Base, 3000K - FC8T9/
Project 'Green' House #1: LED replacement lighting for circular fluorescent tubes // DavidJB.com // Python, Technology, Web, Linux, and more, by David Beitey
Philips 32-Watt 12 in. Linear T9 Circline Fluorescent Tube Light Bulb Bright White (3000K) (1-Pack) 391227 - The Home Depot
BULBMASTER FC8T9/WW 22 Watts 8 Inch Round T9 Fluorescent Circular Light Bulb, Warm White 3000K, FC8T9 980 Lumens G10Q 4-Pin Base 22W Circline Ceiling Lights - Amazon.com
FC22T5/865 Outside PINS 22W 22 Watt 7.25 inch Diameter Circular Fluorescent lamp/Bulb for Magnifying Lamps - Amazon.com