As I think about it, it might be best if there was a single array of
high output LEDs. *When both "colors" of the array are "on" then you
have a single visible color that means "ok" (red and blue make green in
concept, but in emitted light that combination doesn't work). *That way
the glider pilot can verify at the start that both signals "work" and
they stay "on" for the duration of the tow. *If either the "warning" or
"get off" switches are selected in the cockpit then only the
corresponding "color" is then visible to the glider pilot. *Perhaps with
the "warning" being a steady signal and "get off" being a rapid flash to
help with fast recognition and a sense of urgency.

Other thoughts?

People will misunderstand lights just as easily as a rudder waggle.

Its a training issue and they just need to know what the signal means
by practice.

It takes a bit of time to learn and mistakes WILL be made but that is
no reason to throw out the
standard signals becasue of a few.

Of the 10,000+ glider pilots I am sure only a couple dozen have
released on rudder waggles.

Thats 0.24%, and completely insignificant justification to change
anything but the rigor of those few pilots training who are
having problems.

Lights fail, radios fail, tow plane electircal systems fail and a Wag
or a Rock will still communicate with a glider on tow.

The signal system works just fine, its just that the receivers of the
signal are learning something new to them and sometimes
mistakes are made.

We should start a thread on Pilot Mistakes, and you can be sure there
will be 1000 hr pilots making entires there as well.

Ray