"Morgans" wrote in message
...

Don't they have a pretty slow heat up, cool down time? If the answer is
yes, they would not be as recognizable as something that had an instant
off
(dark), instant on (bright) cycle - like LED's, would they? Or is that
not
a big factor?

I remember flying the Adcock (A-N) range from Yakima to Ellensburg one day
in my Dad's Cessna 120. Something made me look up and I saw a C-124 coming
straight at me about ¼ mile away. All I remember is his anti-collision light
flashing in my eyes. That light was an oscillating beam like a train
headlight of the era. It didn't have the instant off/on quality of a strobe
or an LED, but it sureintheheck got my attention RFN!

Jim has published a lot of dope on flashers for anticollision purposes.
IIRC, he not only takes the properties of the device into consideration but
also the properties of the H.U.M.A.N. interface system. If I ever get around
to putting this together, I look it up.

Than again, I might be wrong. In that case, never mind.

Rich S.