RS PRO 12 W Circular Fluorescent Tubes, 135mm, G10Q | RS
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. T9 Circline Linear Fluorescent Tube Light Bulb, Daylight Deluxe (6500K) (1-Pack) 262600 - The Home Depot
Replace 32W T9 Circular Fluorescent Tubes With 20W LED
Circular 60w Fluorescent Tube Warm White | Crompton (CIR60SPWW)