Philips 22-Watt 8 in. Linear T9 Fluorescent Tube Light Bulb Cool White (4100K) Circline 391169 - The Home Depot
Technical Precision 8.5 Inch Circline Bulb Replacement for General Electric G.E FC8T9 /KB FC8T9 22W Light Bulb with G10Q-4 4 Pin Base - 3000K Circline Fluorescent Bulb - 1 Pack
Feit Electric 8 in. 15-Watt (22-Watt Equivalent) T9 Cool White 4100K G10Q Circline LED Light Bulb (12-Pack) FC8/840/LED/12 - The Home Depot
Osram Lumilux T5 Circular FC 22W - 827 Extra Warm White | 23cm| Any-lamp
22W 32W 40W Circular LED Tube T5 T8 round tube light circle Ring lamp LOT | eBay
Feit Electric Color select 22-Watt EQ 8-in Cool White G24d-2 Pin Base Circline Type A LED Tube Light Bulb in the LED Tube Light Bulbs department at Lowes.com