Recent content by engtipsgunter

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

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...