This might be a unique solution to cabinets without a bottom "rail". It appears that the lighting is from behind the cabinets, shining downward. Some cabinet mfgs, one being Ikea, have space behind the cabinet (about a 1/2") which I've used in the past to route undercabinet puck lights. You could easily mount long LED lights behind and at the bottom of such cabinets with the same effect. Actually looks much better this way. Also looks like they've done the same with at the top of the cabinets.