FC8T9/CW Circular Fluorescent Light Bulb, 8 Inch Circline T9 22W Lamp Tube for r | eBay
Project 'Green' House #1: LED replacement lighting for circular fluorescent tubes // DavidJB.com // Python, Technology, Web, Linux, and more, by David Beitey
How to change Circline Fluorescent Light Bulb - YouTube
AMATRON ETL Listed 16" T9 24W LED Circline Bulb LED Circular Tube 5000K Daylight Frosted Lens with Non-Dimmable External Power Driver to Replace 16 inch 40W Fluorescent Circline - Led Household Light