Philips 13-Watt 21 in. Linear T5 Fluorescent Tube Light Bulb Bright White (3000K) 546481 - The Home Depot
GE Replacement 13-Watt EQ 21-in Color Select Linear Type A LED Tube Light Bulb in the LED Tube Light Bulbs department at Lowes.com
LWL4W40-F8T5 12“ 4Watts White LED T5 Tube with 4000K to Retrofit for 8W T5 Fluorescent Tube of Your Under-Cabinet Lights to get Over 50% Energy Saving! Replace Directly! F8T5-LED4W40 (3) - -
Lightwise LWL7W40-F13T5 21" Direct Replacement Led Tube, 7-Watt, White, 4000K, Retrofit 13W T5 Fluorescent Tube of your Uncder-Cabinet Lights 50% Energy Saving, Replace Directly Set of 3 - - Amazon.com
Replacement 21" F13T5 LED Tube for Fluorescent Fixtures
GE Fluorescent 13-Watt, 21 inch, T5 Tube Light Bulb, Kitchen and Bath Warm White Color, 2-Year Life, 1pk - Walmart.com
F13T5WW – T5 21 Inch Under Counter Fluorescent Bulbs Warm White 3000K 13-Watt F13T5/WW 21” WW Long Life Replacement Tubes for Under Cabinet Lights – Pack of 6 Bulbs - - Amazon.com