Thanks for the question! The under cabinet lighting shown here consists
of Xenon Low Voltage Triangle Light pucks such as these: http://www.pegasuslighting.com/xenon-triangle-lights.html, but unfortunately they are discontinued.

The type we use most often these days are LED products by AFX that we hardwire: http://www.afxinc.com/product/type/undercabinet/noble-pro-led-nllp/nllp40rb.html. They are available at several retailers: http://www.afxinc.com/where-to-buy.html