Feit Electric 12 in. 20-Watt (32-Watt Equivalent) T9 Cool White 4100K G10Q Circline LED Light Bulb (4-Pack) FC12/840/LED/4 - The Home Depot
GE Circline 22 Watt Fluorescent Light Bulb - #11084 | Lamps Plus
AMATRON ETL Listed 8" T9 LED Circline 11W Day Light 5000K Frosted Lens with Non-Dimmable External Power Driver to Replace 8 inch 22W Fluorescent Circline Bulb - - Amazon.com