Osram Lumilux T5 FC Fluorescent Circline 55 Watt Warm White (Tube Only)
Feit Electric Color select 30-Watt EQ 9-in Cool White G24q-2 Pin Base Circline Type A LED Tube Light Bulb in the LED Tube Light Bulbs department at Lowes.com
Osram Lumilux T5 Circular FC 55W - 840 Cool White | 30cm| Any-lamp
SYLVANIA T5 Circline Fluorescent Tube Light Bulb, 40W, Soft White Color Temperature, 1 pack - Fluorescent Tubes - Amazon.com
Osram FC 55W/830 55W 3000K Lumilux Warm White 2GX13 Circline 4200lm