LED / Nav lights

Scott Gettings wrote:
This site was noticed during my original research. $120 per position
light is not very reasonable in my opinion, when you can get a certified
light for not that much more.

Read it again, it is NOT per light it is for both of them. It really is pretty
reasonable when you consider all the enginering and boards are already done.

Jerry

Jerry Springer wrote:

Scott Gettings wrote:
This site was noticed during my original research. $120 per position
light is not very reasonable in my opinion, when you can get a certified
light for not that much more.

Read it again, it is NOT per light it is for both of them. It really is pretty
reasonable when you consider all the enginering and boards are already done.

Jerry

Go for it. I'm sure they are happy to have your money.

Scott

Scott Gettings wrote:
This site was noticed during my original research. $120 per position
light is not very reasonable in my opinion, when you can get a certified
light for not that much more.
On the other hand you can buy a pair of 1-watt red Luxeons for about $20,
and a single, 3-watt green one for about $15. Their 140-degree
"lambertian" pattern is easily wide enough for nav lights, especially if
you use two of them 90 degrees apart. Most other LEDs have very narrow
visibility geometry and have far less light output. Many trying to use
them have given up.

For strobes, surely you can solder together numerous white LEDs in a
360-degree or other geometry. If a "high-powered" LED produces 4
candlepower (4,000 mcd), you'll still need over 100 of them! Or you can
use a few, newer Luxeon LEDs that are still relatively inexpensive. I
calculated you'll spend about $75 for Luxeons that produce over 400 cp
and only have to assemble a small number of LEDs.

I have no financial interest in Luxeon or any other LED product. My
comments were solely to let builders know there is another viable option
and give them another possibility to save money by building it
themselves.

I'll have to agree with you on the advantage of the Luxeon for strobes.

However, for postition lights, the red and green have to span 110
degrees, and the white taillight has to span 140 degrees. Each one's
light output is to taper in the vertical direction. The individual
LED's are much easier to arrange and aim properly, and 10 or so aren't
that difficult to solder together. My airframe is steel tube, so I
already have a rather large heat sink 8*).

--
http://www.ernest.isa-geek.org/
"Ignorance is mankinds normal state,
alleviated by information and experience."
Veeduber

Ernest Christley wrote:

Scott Gettings wrote:
This site was noticed during my original research. $120 per position
light is not very reasonable in my opinion, when you can get a certified
light for not that much more.
On the other hand you can buy a pair of 1-watt red Luxeons for about $20,
and a single, 3-watt green one for about $15. Their 140-degree
"lambertian" pattern is easily wide enough for nav lights, especially if
you use two of them 90 degrees apart. Most other LEDs have very narrow
visibility geometry and have far less light output. Many trying to use
them have given up.

For strobes, surely you can solder together numerous white LEDs in a
360-degree or other geometry. If a "high-powered" LED produces 4
candlepower (4,000 mcd), you'll still need over 100 of them! Or you can
use a few, newer Luxeon LEDs that are still relatively inexpensive. I
calculated you'll spend about $75 for Luxeons that produce over 400 cp
and only have to assemble a small number of LEDs.

I have no financial interest in Luxeon or any other LED product. My
comments were solely to let builders know there is another viable option
and give them another possibility to save money by building it
themselves.

I'll have to agree with you on the advantage of the Luxeon for strobes.

However, for postition lights, the red and green have to span 110
degrees, and the white taillight has to span 140 degrees. Each one's
light output is to taper in the vertical direction. The individual
LED's are much easier to arrange and aim properly, and 10 or so aren't
that difficult to solder together. My airframe is steel tube, so I
already have a rather large heat sink 8*).

--
http://www.ernest.isa-geek.org/
"Ignorance is mankinds normal state,
alleviated by information and experience."
Veeduber

Go for it. Remember that the Lambertian pattern Luxeons have a 140-degree
pattern.

Scott

Scott,

Thanks for the great information. I really like the new luxeon LED's.
I did a internet search and found that Honeywell has a LED position
light for business jets ......

http://www.grimesaero.com/info/liter...ngposition.pdf

Looks like they using one Luxeon Star with lambertian distribution and
two Luxeon emitters with side emitter domes. They report a total of 9
watts so I wonder if they are using 3 three watt Luxeon III's?

Thanks again for the useful inforation.

--Mike
Sonex #293

Michael Crowder wrote:

Scott,

Thanks for the great information. I really like the new luxeon LED's.
I did a internet search and found that Honeywell has a LED position
light for business jets ......

http://www.grimesaero.com/info/liter...ngposition.pdf

Looks like they using one Luxeon Star with lambertian distribution and
two Luxeon emitters with side emitter domes. They report a total of 9
watts so I wonder if they are using 3 three watt Luxeon III's?

Thanks again for the useful inforation.

--Mike
Sonex #293

You are welcome, and correct the Luxeon IIIs. I wonder how much
Honeywell is charging to put 3 LEDs in their fixture? The Luxeons are
worth about $45 retail.

Scott

Scott Gettings wrote in news:406B6C00.75AB45C3
@cfl.rr.com:


You are welcome, and correct the Luxeon IIIs. I wonder how much
Honeywell is charging to put 3 LEDs in their fixture? The Luxeons are
worth about $45 retail.

Scott


I wonder what they are doing for the Red LED's? Lumiled doesn't seem to
have the Luxeon III emitter in Red or Red/Orange colors, although the 1W
parts are pretty bright. The Honeywell datasheet doesn't show a difference
in current requirements between the RED and Green lights. I wonder what
they are doing.

--Mike
Sonex #293

Michael Crowder wrote:

Scott Gettings wrote in news:406B6C00.75AB45C3
@cfl.rr.com:

You are welcome, and correct the Luxeon IIIs. I wonder how much
Honeywell is charging to put 3 LEDs in their fixture? The Luxeons are
worth about $45 retail.

Scott


I wonder what they are doing for the Red LED's? Lumiled doesn't seem to
have the Luxeon III emitter in Red or Red/Orange colors, although the 1W
parts are pretty bright. The Honeywell datasheet doesn't show a difference
in current requirements between the RED and Green lights. I wonder what
they are doing.

--Mike
Sonex #293

Must be using 1 watt Luxeons. These are pretty bright at about 44 lumens. I
used 2 ($20 worth) in my left wingtip, and they are so bright you can't look
at them.

Scott

FYI, here's another site for pre-made LED position lights:
http://www.periheliondesign.com/ledlights.htm

He has a Luxeon Star Portable 5.6W white tail-light too. (Might be
prohibitively expensive for many, tho'. These Luxeon's aren't cheap!)

(Again, for the record, I have no financial interest, blah blah blah.)

Greg Reid http://www.DivorceMagazine.com/Vision132

Greg Reid wrote:

FYI, here's another site for pre-made LED position lights:
http://www.periheliondesign.com/ledlights.htm

He has a Luxeon Star Portable 5.6W white tail-light too. (Might be
prohibitively expensive for many, tho'. These Luxeon's aren't cheap!)

(Again, for the record, I have no financial interest, blah blah blah.)

Greg Reid http://www.DivorceMagazine.com/Vision132

Actually, a 3w luxeon is less than $20 -- more than enough for any tail
light. The other $130 goes to the guy. Get a surplus housing and drop
in an LED!

(Also no financial interest).

Scott Gettings