Project 'Green' House #1: LED replacement lighting for circular fluorescent tubes // DavidJB.com // Python, Technology, Web, Linux, and more, by David Beitey
FC40T5-84-GE - 40w T5 305mm Circular Colour:84 – The Lamp Company
40W Circular Fluorescent Tube T5 Warm White | 300mm Dia
40w Circular Fluorescent Fitting with Small Glass | Fitzgerald (SF40/27)
Buy Supreme 60W T9 Triphosphor Circular Fluorescent Tube Warm White from £13.99
22w Circular T5 Tube 840 - Light Bulbs 2 U
60w T9 Circular Fluorescent Tube Bell G10Q 3000k 400mm Warm white 5013588041933 | eBay