My sun room is my sewing room. It faces west with large windows west and south. The natural light is excellent until about 4pm when it starts to warm up. That's when I make myself get up and go to Curves. I limit my sewing to 4-5 hours, otherwise I wouldn't spend any time with DH.
Occasionally I do sew at night, but not often. My lighting is a desk lamp with magnifying glass that I bought at JoAnn's and an overhead light. Again, the light is very good, but I prefer daylight hours. I do have to be careful not to expose my fabric to the sun.
It's a small room but very serviceable.