BULBMASTER FC8T9/CW 22 Watt 8 Inch Round T9 Fluorescent Circular Light Bulb, Cool White 4100K, 1120 Lumens G10Q 4-Pin Base 22W Circline Ceiling Lights : Amazon.co.uk: Lighting
T9 LED Circline Light Bulb 12 inch, 16W 6000K 1920LM, 9" LED Circular Tube Light, Replacement for Fluorescent Lamp Fixture FC12T9 (Ballast Must be Removed Or Bypassed) : Amazon.co.uk: Lighting
Project 'Green' House #1: LED replacement lighting for circular fluorescent tubes // DavidJB.com // Python, Technology, Web, Linux, and more, by David Beitey
Xiangyin Circular Light Bulb Tube, 4.8 Inch LED Ceiling Light Fixtures Replacement Light Bulb Replace Incandescent Fluorescent Bulb Round Tube,11W T4 White Light,4-Pin Base : Amazon.co.uk: Everything Else
4 Easy Ways to Change a Circular Fluorescent Light Bulb - wikiHow
T5 Circular 300mm 40w - Allday Lamps
Project 'Green' House #1: LED replacement lighting for circular fluorescent tubes // DavidJB.com // Python, Technology, Web, Linux, and more, by David Beitey