thanks for the help, and sorry for the very late reply. So it would not be possible as an everyday window due to the variation in incidence angle? Seems to be a conflict in answers here, thank you anyway.
Would it be possible to use 2 sheets of glass as a window, within the 2 sheets of glass are 2 polarising filters, acting as blinds sandwiched in the glass, at 90degrees from each other. By remote the polarised lens can ascend or descend up and down the window blocking light at different levels...