I am very particular with my lighting. I like natural light, but cannot stand may types of artificial lighting. In my home, I don't have curtains over some of the windows, and only have blinds, which stay open most of the time during the day, bathing the inside of the house with nice full-spectrum sunlight from the outside.
One of the issues that I have is not so much the amount of light, but the way it is aimed. I cannot stand direct sunlight, or any source of light directly in my eyes...IE glare. Around my house, I have soft, indirect lighting with "natural sunlight" bulbs. They have solid-state ballasts in them so they don't flicker. In the evenings, when it's dark out, I also lower the amount of ambient light around me. That has a calming effect on me, and prepares me to go to sleep at night.
Since I am rather concious about wasting energy, I tend to turn things off when I leave the room, so my house generally appears rather dark most of the time, since I only use lighting in the rooms I'm occupuying.