Circle (6 Pack F17T8/865 Daylight White T8 Fluorescent Tube Light Bulbs, 24 Inch, 17W, Medium Bi-Pin (G13) Base, 6500K Color Temperature - Amazon.com
ETi 48-Watt 4 ft. Linear LED Tube Light Bulb Retrofit Conversion Kit Replaces 8 ft. T8 T12 Fluorescent 7200 Lumens (8-Pack) 64101162-8PK - The Home Depot