22W T5 Circular Fluorescent Bulb Replacement for Floxite T5 22W Circular Mirror Light Bulb by Technical Precision - 4-Pin Connector Base Circline Fluorescent Bulb - 6500K - 7.25 Inch Outside Diameter - - Amazon.com
Envirolux 55W T5 Circular Fluorescent in Cool White | Beacon Lighting
Osram 40w T5 830 Circular Fluorescent tube
Circular T5 – FirstLightDirect
11W T4 Round Annular Tubes Lamps Bulb Fluorescent Ring Lamp Tube With 4 Pins - Walmart.com
Project 'Green' House #1: LED replacement lighting for circular fluorescent tubes // DavidJB.com // Python, Technology, Web, Linux, and more, by David Beitey