Amazon.com: VIVOSUN T5 Grow Light Bulbs 54W 6500K HO Fluorescent Tubes Light Bulbs, Cool White T5 Bulb for 46 Inches T5 Light Fixtures, T5 Grow Lights for Indoor Plants, Pack of 5 :
Feit Electric 32-Watt 4 ft. T5 G13 Type A Plug and Play High Output Linear LED Tube Light Bulb, Selectable White (2-Pack) T548HO/4CCT/LED/2 - The Home Depot
Simply Conserve 54-Watt EQ T5 Cool White Miniature Bi-pin (T5) LED Light Bulb (25-Pack) in the Tube Light Bulbs department at Lowes.com