Philips 32-Watt 12 in. T9 Circline Linear Fluorescent Tube Light Bulb, Daylight Deluxe (6500K) 262600 - The Home Depot
Project 'Green' House #1: LED replacement lighting for circular fluorescent tubes // DavidJB.com // Python, Technology, Web, Linux, and more, by David Beitey
DIY How to Change a Circular Light Bulb | Ceiling Overhead Light | 22W Bulb [Circular Light Bulb] - YouTube