Enlarge the holes: If it is possible and the house estructuta allows, it’s easier to win is to extend daylight windows. If this is not possible, please note that you can also change the woodwork for a narrower grid boxes and avoiding the blinds.
The staircases and skylights: poorly lit areas, like hallways or buardillas, get pretty good with a bit of overhead light. A skylight or a window as prefabricated roof are two good solutions.