481THz experiments

Many years ago before my 2013 stroke I bought some Flatlights (very bright LEDs) from the USA to enable me to get further with my optical experiments over the horizon. Even with quite low power LEDs I had got way over the horizon. 

Both my RX and optics could have been improved, so I was expecting much greater ranges. Then I had my stroke and I was unable to continue. To this day the Flatlights remain in the drawer unused.