Unfortunately the more we use lighting at home, the more electricity we have to pay, and that is not cheap at all these days. So the only way to save a bit on the electricity costs with lights is by using the proper illumination system that use less electricity.
Also depending on where you install your illumination source, it will give you more or less visibility. For example installing a ceiling chandelier will give you more light source than a wall mounted one. Of course using ceiling lights everywhere in the home is not feasible, so around the place where you have installed the lighting, you need to use reflecting colors that will help give out more light and make your room brighter. Another thing you can do is use lighter colored wall paints instead of wall paper in the rooms as these also reflect light much better than paper.
Installing mirrors in some rooms is another way to reflect light back. By having an extra mirror in the bedroom for example you achieve sometimes twice the illumination that you’d otherwise get without it.