Jonathan Hallameyer wrote:
> Ive seen some red-green LEDs that I have a hard time telling the
> difference between green and yellow states. And some others are more
> orange than yellow, and you cant tell if it is in red or yellow state.
> And I have "normal" vision other than some near sightedness. So yes,
> avoid R-G tricolor LEDs if at all possible.

This is somewhat of an aside, but it illustrates the problem.  Yesterday I
was assistant-reffing a soccer game.  One team wore darkish green shirts and
the other darkish red.  This field is in a large open area with the horizon
being the tops of trees about 300 meters away.  It was raining, and at the
beginning of the second half it was coming down hard with dark clouds above,
but a lighter patch just above the trees on the other side of the field from
me.  I was tracking the second to last defender, and was keeping my eye on
an attacker that was is off sides position.  When she received the ball I
raised my flag, and then realized that her shirt was in fact green, not red.
I put my flag down right away and felt like an idiot.  Even after realizing
this was a problem and paying extra careful attention, it was sometimes not
easy at all to distinguish the two shirt colors.


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