NYLL - 16 Inch/ 16" Plug & Play T9 Circline LED Lamp - Warm White (2700K) Circular Bulb Directly Relamp 40 Watt Fluorescent Bulb FC16T9/WW, FCL40 (without rewiring or modification) - Ballast Required! - Amazon.com
G10Q CIRCLINE 40w 4000K /840 PHILIPS
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