60W T9 2D Circular Round Fluorescent Low Energy White Lamp Bulb - 3000k or 4100k | eBay
Project 'Green' House #1: LED replacement lighting for circular fluorescent tubes // DavidJB.com // Python, Technology, Web, Linux, and more, by David Beitey
Technical Precision T4 Type 12 Watts Fluorescent Philippines | Ubuy
DIY How to Change a Circular Light Bulb | Ceiling Overhead Light | 22W Bulb [Circular Light Bulb] - YouTube
4 Easy Ways to Change a Circular Fluorescent Light Bulb - wikiHow
BULBMASTER FC8T9/CW 22 Watt 8 Inch Round T9 Fluorescent Circular Light Bulb, Cool White 4100K, 1120 Lumens G10Q 4-Pin Base 22W Circline Ceiling Lights : Amazon.co.uk: Lighting