Thanks guys. All very interesting ideas. I also keep thinking about some form of axis tracker. Even a single axis wouldn't be too bad, but it would probably need to be adjusted every few weeks I guess. Of course we're talking about some electronics and little movement motors which is somewhat unavoidably complex for the common man. I would think something like this would be great to market though if someone could figure out the electronics stuff.(cheaply enough)
Most people would LOVE to get some more natural light into their rooms and basement rooms if it didn't cost too much. Previously, I had lived 24 years in a house that was quite dark all the time in every room, since it had dark green carpet and the fixed garage was on the sunny side. And two sides of the house was right on the edge of a big woods. But now, I am very happy to have some wonderful sun light at my new house. It does make me feel way better I think. I can't stand darkness inside when the sun is shining outside.
If I build a house again, I will think much more about the heating and the NATURAL lighting systems.
Wooferhound: I don't believe the mirror reflects much heat inside. I felt the ceiling where the light hits and it is no warmer than the rest of the ceiling. I don't know how long that mirror will last in good condition outside, but you convinced me to caulk the back side also. I had already painted the back of the mirror with white enamel spray can paint. Hopefully it will last at least a year. I can always put a new "cheap" mirror into the frame each year and re-caulk it in about 10 or 15 minutes.
There is one more important thing I forgot to mention in the original post. If anyone makes one of these, be VERY careful that the mirror don't swing up and break your expensive window during high winds or a thunderstorm!! I am still working on fixing (preventing) this problem. A thunderstorm can happen in the middle of the night unexpectedly. I might have a string on the back side of the mirror that ties it down somehow, or some kind of a metal rod bracket that prevents the mirror from being able to swing up too high where it could hit and break the window. To come to think of it, I also forgot to mention my disclaimer: It is the following:
"I'm responsible for nothin'--(if you make one of these)--and you're responsible for everything."
Thanks all for the good comments. If anyone has anything else to add to the discussion, please do so!!! We all benefit!
(HIKER -"PassingWind" IS still generating during a rare windy day in the summer.(or a thunderstorm) However, the yaw axis don't turn as easy anymore (less grease I guess) and because it is a downwind turbine, I often have to manually turn the stupid thing with a long aluminum extension pole to get it into the wind. I think I soon am going to convert it to an UPWIND generator and put 4 (instead of 3) new blades on it. -Thanks.)