Project 'Green' House #1: LED replacement lighting for circular fluorescent tubes // DavidJB.com // Python, Technology, Web, Linux, and more, by David Beitey
22W 32W 40W Circular LED Tube T5 T8 round tube light circle Ring lamp LOT | eBay
Large (12-16″) Circular Fluorescent Tube – The M.e.t.
Philips 32-Watt 12 in. Circline T9 Linear Fluorescent Tube Light Bulb, Cool White Plus (4100K) (12-Pack) 391177 - The Home Depot | Fluorescent tube light, Fluorescent tube, Tube light
Circular Fluorescent Light Bulb 10 W - LAMP12/10
Lighting Supply Blog: A Little Light Reading - LIGHTING SUPPLY
6.5 inch 20-Watt T9 Cool White Circline Fluorescent Light Bulb | City Mill
AMATRON ETL Listed 16" T9 24W LED Circline Bulb LED Circular Tube 5000K Daylight Frosted Lens with Non-Dimmable External Power Driver to Replace 16 inch 40W Fluorescent Circline - Led Household Light
Current GE LIGHTING 32W, T9 Circular Fluorescent Light Bulb FC12T9/KB | Zoro