Project 'Green' House #1: LED replacement lighting for circular fluorescent tubes // DavidJB.com // Python, Technology, Web, Linux, and more, by David Beitey
8 Inch T9 22W Circline Fluorescent Light Bulb, UK | Ubuy
HPM Nelson Circular Fluorescent Lamp 22W Natural Light
FC40T5-86-NA - 40w T5 305mm Circular Colour:86 – The Lamp Company