Project 'Green' House #1: LED replacement lighting for circular fluorescent tubes // DavidJB.com // Python, Technology, Web, Linux, and more, by David Beitey
Caprock FC22T5/865 22W 22 Watt 7.25 inch Diameter Circular Fluorescent lamp/Bulb for Magnifying Lamps - - Amazon.com
11W T4 Round Annular Tubes Lamps Bulb Fluorescent Ring Lamp Tube With 4 Pins - Walmart.com
913818-3 GE Lighting 22 Watts Circular Fluorescent Lamp, T9, 4-Pin (G10q), 1100 Lumens, 4100K Bulb Color Temp. | Imperial Supplies
Feit Electric Color select 32-Watt EQ 12-in Cool White G24q-2 Pin Base Circline Type A LED Tube Light Bulb in the LED Tube Light Bulbs department at Lowes.com
Circline Fluorescent Lamp stock image. Image of economy - 38433181