Project 'Green' House #1: LED replacement lighting for circular fluorescent tubes // DavidJB.com // Python, Technology, Web, Linux, and more, by David Beitey
Caprock General 114865 11 watt Circular Fluorescent lamp for Desktop Magnifying Lamps, 6500 Degrees Daylight Illumination - - Amazon.com
Feit Electric 20-Watt 12 in. T9 G10q Type A Plug and Play Linear Circline LED Tube Light Bulb, Tunable White FC12/3CCT/LED - The Home Depot