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
Philips 13W 21 In. Cool White T5 Bi-Pin Fluorescent Tube Light Bulb - Crafty Beaver Home Center