Imagine a long U shaped kitchen. I want to put some chrome spotlights in a rectangle shape in the ceiling. How far do people put them from the side walls ? The units are standard 600mm wide and I will have some wall units. I have friends who have them and they moan about the bulbs going all the time and a pain to replace. I'd prefer low voltage lighting so can anyone reccomend a decent brand specifically for a kitchen with insulation and loft space above.