Norman Lamps FCT5-40W-CW Cool-White 4100K - Watts: 40W, Type: T5 Circular Fluorescent, Color - Fluorescent Tubes - Amazon.com
Feit Electric Color select 32-Watt EQ 12-in Cool White G24q-2 Pin Base Circline Type A LED Tube Light Bulb in the LED Tube Light Bulbs department at Lowes.com