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  1. engtipsgunter

    Ultraviolet Light

    Remember a filter only removes light wavelength and does not convert them. But somebody may have a laser scheme to do this.
  2. engtipsgunter

    Solar screens vs. Window tinting: Which is better?

    Just thought I add this to phex's comments: Before the advent of air conditioning on a large scale, there used to be solar screens which were essentially micro Venetian blinds stamped out of sheet metal. The flat part was angled such that you can see out the window horizontaly or downward, but...
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