snip
I stood out on the ramp at the FSDO with an
inspector who called the tower on a handheld. It was an overcast day
and the tower had the green shades pulled down (I have no idea why) The
white and green lights looked rather close in shade to me but different
enough to tell apart. Even now when flying at night, from a long
distance the green/white flash of an airport beacon is tough to tell
apart until I get closer - the green flash always looks darker though.

This is exactly what I had to do. When I passed they issued me a new
medical certificate on the spot.

I also have trouble with the airport beacon but could tell you the white
from green if I had to.

Another place where I can have problems is on VASI or PAPI's. During the
day they (the red's) sometimes are hard to distinguish. At night I am OK.


Jon Kraus