AVSIG: Strobing Runway Lights wwswsigarch.jpg (7236 bytes)

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AVSIG Discussion Sections >> Training & Proficiency

Bob Dubner
Super Imperial Member


Reged: 08/31/01
Posts: 4759
Loc: Extreme Upper West Side
Strobing Runway Lights
      12/16/17 05:16 PM

This is deja vu all over again.

Once upon a time, when traffic lights were colored glass filters over white
incandescent bulbs, some blue was added to the green to make them more
visible to people with red-green color blindness.

Obviously, LEDs are they way to go, now; too many reasons for using them to
ignore -- lifetime, power consumption, and so on.

But it's going to take a few years to sort out. Clearly, the aliasing
wagon wheel effect of the LEDs seen through a propeller arc is unacceptable.
That's going to require DC drivers, or driving different LEDs in the clusters
at different phases and/or different frequencies, or something I haven't
thought of in the thirty seconds I've been considering the problem.

And the fact that LEDs radiate in narrow bands that some people might be
insentive to is also tricky. There aren't any white LEDs; they work by
having the LEDs, usually blue or ultraviolet, stimulate flourescent material
that radiate in the red, blue, and green, which combined produce a
pseudo-white. Now that a true safety need is being demonstrated, one can
only assume and hope that the folks developing those phosphors will continue
their efforts in making the radiation more broad-band.

Another thing that has to be kept under control is over-enthusiasm for cheap
bright light. A couple of streets in Brooklyn were outfitted with
experimental LED street lights. The street was lit up like an operating
theatre; pretty much everybody hated it. It seems to me that even the safety
argument for that much light is bogus; really bright light means really black
shadows that you can't see into because your eyes aren't dark adapted.

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Entire topic
Subject Posted by Posted on
* Strobing Runway Lights Scott Dyer [HPN/NY] 12/15/17 09:25 PM
. * * Re: Strobing Runway Lights Terry Carraway   12/18/17 02:27 PM
. * * Re: Strobing Runway Lights Russell Holton   12/18/17 05:54 PM
. * * Re: Strobing Runway Lights Ralph Jones   12/15/17 11:25 PM
. * * Re: Strobing Runway Lights Jeff Hartmann CIC   12/15/17 11:23 PM
. * * Re: Strobing Runway Lights Scott Dunham (RDU)   12/16/17 01:27 AM
. * * Re: Strobing Runway Lights Scott Dyer [HPN/NY]   12/16/17 03:15 AM
. * * Re: Strobing Runway Lights Russell Holton   12/16/17 04:12 AM
. * * Strobing Runway Lights Bob Dubner   12/16/17 05:16 PM
. * * Re: Strobing Runway Lights Russell Holton   12/18/17 11:08 PM
. * * Re: Strobing Runway Lights Gil Buettner [KAUW]   12/18/17 10:39 PM
. * * Re: Strobing Runway Lights Scott Dyer [HPN/NY]   12/19/17 06:54 PM
. * * Re: Strobing Runway Lights Russell Holton   12/19/17 07:31 PM
. * * Re: Strobing Runway Lights Scott Dyer [HPN/NY]   12/20/17 01:04 AM
. * * Re: Strobing Runway Lights Russell Holton   12/20/17 01:34 AM
. * * Strobing Runway Lights Bob Dubner   12/21/17 06:36 AM
. * * Re: Strobing Runway Lights Terry Carraway   12/24/17 03:27 AM
. * * Re: Strobing Runway Lights Russell Holton   12/24/17 11:54 PM
. * * Re: Strobing Runway Lights John O'Shaughnessy [FCM]   12/25/17 03:02 PM
. * * Re: Strobing Runway Lights Russell Holton   12/25/17 07:06 PM
. * * Re: Strobing Runway Lights Tom Charlton   12/25/17 05:35 PM
. * * Re: Strobing Runway Lights Terry Carraway   12/25/17 12:20 PM
. * * Re: Strobing Runway Lights Scott Dyer [HPN/NY]   12/20/17 02:48 AM
. * * Re: Strobing Runway Lights Russell Holton   12/20/17 09:28 PM
. * * Re: Strobing Runway Lights Scott Dyer [HPN/NY]   12/20/17 10:29 PM
. * * Re: Strobing Runway Lights Nancy Zeitlin [HPN]   12/20/17 04:47 PM
. * * Re: Strobing Runway Lights Scott Dyer [HPN/NY]   12/20/17 09:07 PM
. * * Strobing Runway Lights Ward Miller POU-NY   12/20/17 10:40 PM
. * * Re: Strobing Runway Lights Scott Dyer [HPN/NY]   12/21/17 02:17 AM
. * * Re: Strobing Runway Lights John O'Shaughnessy [FCM]   12/20/17 09:24 PM
. * * Re: Strobing Runway Lights Russell Holton   12/20/17 09:37 PM
. * * Re: Strobing Runway Lights Scott Dyer [HPN/NY]   12/20/17 10:33 PM
. * * Re: Strobing Runway Lights Russell Holton   12/20/17 11:28 PM
. * * Re: Strobing Runway Lights Randy Sohn   12/16/17 01:57 AM
. * * Re: Strobing Runway Lights Russell Holton   12/15/17 11:20 PM
. * * Strobing Runway Lights Ray Tackett   12/15/17 10:19 PM
. * * Re: Strobing Runway Lights Scott Dyer [HPN/NY]   12/15/17 11:32 PM
. * * Strobing Runway Lights Ray Tackett   12/16/17 01:13 AM

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