Since the 'sun' is available and controlled in position by long/lat/time (I have not tried to change the color as yet...is it possible?)
Suggest a user option (check on/off) be added to fully control the brightness and color of the sunshine.....in that way the sun becomes a "spot light" at an infinite distance (parallel light rays) that can be used for controlled lighting...such as darker days without clouds
Better would be to make that light source as a "distant light" so more than one could be used for broad lighting a scene....including interiors.
Doug.S