Philips 13-Watt 21 in. Linear T5 Fluorescent Tube Light Bulb Bright White (3000K) (1-Pack) 546481 - The Home Depot
F13T5CW – T5 21 Inch Under Counter Fluorescent Bulbs Cool White 4100K 13-Watt F13T5/CW 21” CW Long Life Replacement Tubes for Under Cabinet Lights – Pack of 6 Bulbs - Amazon.com
Amazon.com: ULIKELED AC120V 6W G23 LED Bulb 2 Pin Base PLS-13W Fluorescent Lamp Replacement LED PL Horizontal Bulb (G23-6W - 2 Pack, Warm White 3000K) : Everything Else
SPX27 * 13W LED Tubes Fluorescent Replacement 5.7ft - Daylight Warm White | eBay
GE T5 Cool White Miniature Bi-pin (T5) Fluorescent Light Bulb in the Tube Light Bulbs department at Lowes.com
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
LED 13W 4' T5 BYPASS 41K SC | LED Tubes | TCP Lighting
GOCuces T5 LED Tube Lights 13W Replace to F21T5 G5 Base 21W Fluorescent Bulb | eBay