I installed cable lights over the kitchen counters when I was last at the house. My plan was to provide more focused lighting for the stove, sink, and workspaces, but to do it in the least obstructive way possible. I hit upon the idea of cable lights and I had a 50-50 experience with them.
It looks like I can rectify my mistake fairly early, however. First I need new light fixtures that can hold spotlight bulbs. These are pretty cheap, so I bought a few different kinds, from providers in the US and UK.
Next are the bulbs themselves. I found these bulbs come in many types, with beams of various angles. They normally cast a beam of around 40 degrees, but they can be had with an angle as narrow as 12°.
I found a website that allows calculation of the size of a light's coverage area, given the bulb's angle and distance. Fortunately, since these bulbs work on 12 volts, I can buy an assortment here in the US pretty cheaply, too. On my next trip to Aspö, I'll be carrying three light fixtures and 5 different bulbs. I will report back on the success of my lighting experiments!!