Installing a hardwired LED lighting system doesn't need to be difficult. This tutorial will show the ins and outs of energy efficient lighting installation.

The first step in any system is to determine how much flexible LED strips you will need to complete your system. Start by measuring out the area you will be installing the LED strips. For each area where you will be placing an LED strip, subtract 3” inches from the total, this will give you 1.5” on each side of the LED strip to leave room for cable connections.

Under Cabinet Mounting Options – There are two main methods to installing the LED strips under your cabinets. The first method is to install the LED strip on the lip or trim of the cabinet so the LEDs face the backsplash. This will give you one continuous light output while highlighting the backsplash, it will also reduce any reflection of the LED diodes on the countertop. 

The source link: https://www.inspiredled.com/product/hardwired-led-lighting-system/