"Richard Riley" wrote

You could do an LCD shutter.

http://www.smartglassinternational.c...martglass.html

Neat site. It could do some interesting things, such as a fast twinkle,
like strobes do.

It does look like it has disadvantage, as even when it is clear, some of the
light is scattered. That would mean reduced lumens focused on the runway.
:-(

Also, it still would only put the bright beam on a narrow range of potential
viewers. By swiveling, it would pan across a wider angle, while keeping the
focus bright, where more views might see the lights.
--
Jim in NC