Bluex Bulbs 4 Pack T5 21 Inch LED F13T5CW LED Replacement Bulb F13T5 LED 9 Watts 920 Lumens Cool White 4100k F13 T5 13 Watt Bulb in the LED Tube Light Bulbs department at Lowes.com
Sylvania 3' T5 HE LED Tube Lights, 1400 Lumens, 3000 Kelvin/Soft White, 10 Watt, Replace 3' 21 Watt T5 HE Fluorescent Tubes, Case Of 25 Tubes - Walmart.com
EBR020E-0500-42-CE - 21 Watt 500mA Phase Dimming LED Driver - LED Lighting Space
3Ft. Forge LED 21 Watt Canopy Lighting
21 Watt LED Vapor Proof Jelly Jar Light | 2520 Lumens | 5000K | 100-277V