SUNLITE 14in White Round Plastic Cover for AM32 Circline Fluorescent F – BulbAmerica
11W T4 Round Annular Tubes Lamps Bulb Fluorescent Ring Lamp Tube With 4 Pins - Walmart.com
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
2 x 22W T5 Circular Fluorescent Tubes Lamps 2700K Warm White 1300Lm | eBay
Philips 32-Watt 12 in. Linear T9 Circline Fluorescent Tube Light Bulb Bright White (3000K) 391227 - The Home Depot
Project 'Green' House #1: LED replacement lighting for circular fluorescent tubes // DavidJB.com // Python, Technology, Web, Linux, and more, by David Beitey
4 Easy Ways to Change a Circular Fluorescent Light Bulb - wikiHow