Sunlite Circline fixture, 12" Diameter, White Finish
Lighting-Gallery.net - My Fluorescent Lights/Dual Circline I converted from rapid start to preheat
4 Easy Ways to Change a Circular Fluorescent Light Bulb - wikiHow
SYLVANIA (2 Pack) 23521 Cool White Premium Circline Fluorescent T9 Circle 12 inch Diameter, 32 watts, 4100K, 1800 lumens, 80 CRI Fluorescent Light Bulb - Amazon.com
Bulbrite Energy Wiser FCL30/3WAY 10/20/30W Self Ballasted Warm White Circline Fluorescent Light Bulb, Replacement Lamp
lumenivo FC12T9 32W Light Bulb Replacement 12 Inch, T9 Circline Fluorescent Bulb - 4-Pin G10Q-4 Base - Great for Ceiling Fixtures, Garage Lights and Many Applications - 4100K Cool White - 1 Pack - Amazon.com
Project 'Green' House #1: LED replacement lighting for circular fluorescent tubes // DavidJB.com // Python, Technology, Web, Linux, and more, by David Beitey
SUNLITE 14" 2 Lamp Fluorescent Circline Fixture for FC12T9, White Lens – BulbAmerica