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LED Strobes & FAR Requirements

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l_luv2_fly(at)yahoo.com
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Posted: Tue Feb 17, 2009 6:14 am Post subject: LED Strobes & FAR Requirements

Hi all,



I noticed a lot of manufacturers offering LED Strobes at Airventure last year.



I was wondering how do I determine if the light output meets or exceeds a TSP'd Xenon strobe.  I seem to recall that there was a minimum requirement stated in Joules, but I can't be sure.



Does anyone know how I could go about making such a comparison ?



Thanks,  Paul



           [quote][b]

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Eric M. Jones

Joined: 10 Jan 2006
Posts: 565
Location: Massachusetts

Posted: Wed Feb 18, 2009 11:12 am Post subject: Re: LED Strobes & FAR Requirements

Paul,



I wrote up a paper on this some years ago:



www.PerihelionDesign.com/downloads/aircraft_beacons_using_leds.pdf



But beware--I have some work to do on this. At the time LEDs could not quite do the job. They can now. So my conclusion needs revision and I am adding and revising some other details. The power and angle stuff is correct.



 "...Beans for supper tonight, six o'clock. 

      Navy beans cooked in Oklahoma ham...

      Got to eat 'em with a spoon, raw onions

      and cornbread; nothing else...."

       --Will Rogers

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_________________
Eric M. Jones
www.PerihelionDesign.com
113 Brentwood Drive
Southbridge, MA 01550
(508) 764-2072
emjones(at)charter.net

l_luv2_fly(at)yahoo.com
Guest

Posted: Wed Feb 18, 2009 4:56 pm Post subject: LED Strobes & FAR Requirements

Hi Eric,



Thanks for sharing your analysis.  What prompted me to think about this again was the discussion thread about xenon strobe lights and radio noise.  If LED's are now viable then is getting close to the time to retire xenon flashes, high voltage cables, and inverters, along with the RFI and excess weight. 



Thanks again,  Paul

         [quote][b]

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Eric M. Jones

Joined: 10 Jan 2006
Posts: 565
Location: Massachusetts

Posted: Thu Feb 19, 2009 5:38 am Post subject: Re: LED Strobes & FAR Requirements

 	  Quote: 	
		  Thanks for sharing your analysis. What prompted me to think about this again was the discussion thread about xenon strobe lights and radio noise. If LED's are now viable then is getting close to the time to retire xenon flashes, high voltage cables, and inverters, along with the RFI and excess weight. Thanks again, Paul 	




Paul,



That's right. I prototyped a design that uses caps at each strobe. The power supply is 12.5 VDC. The sync pulse is generated at the strobe switch and is simply a 1 ms break in the DC power to the strobes. The strobe LEDs were red Luxeons, but could be white.



As you said, no power supply, no HV, no noise, weighs nothing, lasts forever (more or less).



I looked at a system of strobes where there were a number of flush lights instead of protruding domes. This makes sense if you have LEDs. No solution or suggestions yet, and I don't intend to market such a product.

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_________________
Eric M. Jones
www.PerihelionDesign.com
113 Brentwood Drive
Southbridge, MA 01550
(508) 764-2072
emjones(at)charter.net

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