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

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AVSIG Discussion Sections >> Training & Proficiency

Russell Holton
AVSIG Member


Reged: 07/07/05
Posts: 14136
Re: Strobing Runway Lights
      12/18/17 06:08 PM

Quote:

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.




I'm thinking about changing out the dimmer system to something that works on a different frequency. I'm not sure as there is any simple solution that preserves the dimming function.


Quote:

And the fact that LEDs radiate in narrow bands that some people might be insentive to is also tricky.



I'm sure this is review for you, but as far as I know, there's only two sources of light radiation: back body (thermal) and what I'd call "atomic".

The former is what happens when you heat something so hot it give off light. (Incandescent, halogen, etc.) That kind of light is smooth. (Looking at the spectrum.)

The other kind is the photons given off when an atom drops from a higher level of energy to a lower state. That photon wavelength is specific to the quantum states involved - so a given chemical always gives off the same line(s) of light. (Multiple lines many be involved for a single pure chemical as there may be multiple levels of energy involved.) This is true of florescent, mercury vapor, LEDs (both "direct" and phosphor-based, etc, etc. About the only difference is the method used to get the atoms into the higher energy state in the first place.

The only way to get "white" phosphor is to combine elements so the result looks white to the human eye, even though it's still made up of discrete lines.

This seems to be well established science for florescent lights. I'm not sure why it's a challenge for LEDs - at least the phosphor types.

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

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