Thats a really neat idea and I can see applications in other fields. How opaque do they become when energised? What sort of attenuation level could we hope for?
I programmed a mechanical shutter to go off multiple time during a single Starlight H18 CCD exposure but, due to the time taken for the shutter to operate, its its not really plausible to work much above 5Hz and even then you are knackering the shutter mechanism, if you run it for long.
Thanks for the report.