[Tom Line]

Silly thought. The position of the sun is pretty well-known. If you're going to have a computer system to try to track the most intense light, why not just assume that pointing it directly at the sun is the best and program in the azimuth etc. and have the computer system aim it in the correct dimension based on time of day? Put an "N" mark on your fixture to denote which side needs to be pointed to the north, and you're pretty much good to go...