Under cabinet lighting

The post I believe is for puck lights. Just was not sure what was meant by puck. But the lights looked like hockey pucks, so Bob and others have not wasted there time. Does it make a differance what type of lights are installed in under cabinet wiring?

Cables that are concealed are required to be listed for use in walls, etc. CL2 or CL3 cables or plain old NM cable would be required for those applications.