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LED Landing/Taxi lights

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ianxbrown

Joined: 16 May 2009
Posts: 80

Posted: Fri Oct 09, 2009 4:25 am Post subject: LED Landing/Taxi lights

Can anyone explain how an LED has "reach" problems?  Since the light doesn't know when to stop, I assume this is either about light output (lumens) or focusing, which is nothing to do with the LED's themselves.  I imagine that it's a lot harder to focus LED's with a parabolic reflector when the light origin is not exactly a point source, especially when using multiples.

 

 I just bought some domestic GU10 light bulbs that have a single LED outputting 200 lumens.  That's about half of a 35W halogen so they're getting there.

 

 Ian Brown, Bromont, QC

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nuckolls.bob(at)aeroelect
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Posted: Fri Oct 09, 2009 9:47 am Post subject: LED Landing/Taxi lights

At 07:17 AM 10/9/2009, you wrote:

 	  Quote: 	
		  Can anyone explain how an LED has "reach" problems?  Since the light 

doesn't know when to stop, I assume this is either about light 

output (lumens) or focusing, which is nothing to do with the LED's 

themselves.  I imagine that it's a lot harder to focus LED's with a 

parabolic reflector when the light origin is not exactly a point 

source, especially when using multiples.



I just bought some domestic GU10 light bulbs that have a single LED 

outputting 200 lumens.  That's about half of a 35W halogen so 

they're getting there.


	


   Astute observations sir. Hawker-Beech has been looking

   at LED illumination products for years. During my tenure

   there, every new hopeful supplier to walk in the door

   offered a quantum jump in performance. I'm not sure what

   the criteria at HBC was for deciding when the cost of

   ownership justified the changeovers . . . but changeovers

   were being planned for.



   I bought a multi (60?) LED screw in assembly at Walmart

   a few months back for about $10. My son told me he saw

   a 3-led, eye-tormenting device there last night for about $50.

   Those will be getting cheaper every day. Who can we thank for

   all this?



   For one, the folks who build, erect and program those obnoxious

   bill-boards that are increasingly responsible for highway

   hazard . . . their interest in billions of LEDs sets the

   demands while the can-do entrepreneurs figure out a way

   to meet those demands with ever improving performance and value.



   So while I wince every time I get blasted in the face with

   drivel intended to separate me from my money, I

   remind myself that a byproduct of our physical and

   intellectual sacrifice is technological and economic advancement.

   LED exterior lighting products exist now which are entirely suited

   to the design goals of many builders. The gap is rapidly closing.

        Bob . . .



         ---------------------------------------

        ( . . .  a long habit of not thinking   )

        ( a thing wrong, gives it a superficial )

        ( appearance of being right . . .       )

        (                                       )

        (                  -Thomas Paine 1776-  )

         ---------------------------------------

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