Project 'Green' House #1: LED replacement lighting for circular fluorescent tubes // DavidJB.com // Python, Technology, Web, Linux, and more, by David Beitey
Eveready 40w circular tube G10q - Heathfield LED | Heathfield LED
22W/32W T5/T9 Circular Fluorescent Tube with Ballast - China Circular Lamp, Circular Tube | Made-in-China.com
BELL 60 watt Colour 830 Warm White T9 Circular Tubes