Sunlite Fluorescent Tube Light 54-Watt EQ T5 Daylight Miniature Bi-pin (t5) Fluorescent Light Bulb (40-Pack) in the General Purpose Light Bulbs department at Lowes.com
T5 Essential Linear fluorescent tube 927926783058 | Philips
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