Undercabinet LED lighting is a great DIY project...
Here's what I did. Works out to about $5/ft. Links below are clickable.
Here's a video below - this guy used connectors - I thought soldering was easier and cheaper.
Installing undercabinet LED strips
I suggest watching other videos also, search youtube on "led under cabinet lighting installation" and you will find several. I installed about 2-1/2" from the face of the cabinet to avoid shadows. You'll need 120V for the power supply. Lots of different type LEDs - brightness, temperature (color).
Here's a list of the things I ordered from Amazon:
power supply - $9
LED strip lights - $15 for 16 feet
26 gauge wire - $7.60 for a spool to connect the LED strips (solder)
Aluminum channel diffusers - $27 for 5 pieces of 1 yard each
Dimmers - $10 for 3. Optional parts. I never seem to use mine.
Since then I've added LEDs to my RV, a closet or two, and plans for more.
Q