Sender: <marv@lancaironline.net>
To: lml@lancaironline.net
Date: Mon, 28 Nov 2005 19:59:27 -0500
Message-ID: <redirect-849703@logan.com>
Received-SPF: pass
 receiver=logan.com; client-ip=66.249.82.193; envelope-from=jeffreyb.peterson@gmail.com
DomainKey-Signature: a=rsa-sha1; q=dns; c=nofws;
        s=beta; d=gmail.com;
        h=received:message-id:date:from:reply-to:to:subject:mime-version:content-type;
        b=VxD0aNuEVXKu8JUQfOSUPmGq+WEZfoPXt/5w8dsk79OdlL74BGHjDcpuOYXwE+jkg/lwmcQpmPk6ld0Aj6yLL/yvZmh12L+yuY9Q/cwBfcCZIlt//zb1ssYoLLLRgetx4hkR7WduUQEwzEpPTVxnkc9En5bIeM5R4SG+wC2lXhs=
From: Jeff Peterson <jeffreyb.peterson@gmail.com>
Reply-To: jbp@cmu.edu
Subject: LED Position Lights
MIME-Version: 1.0
Content-Type: multipart/alternative; 
	boundary="----=_Part_11469_5938447.1133224604830"

------=_Part_11469_5938447.1133224604830
Content-Type: text/plain; charset=ISO-8859-1
Content-Transfer-Encoding: quoted-printable
Content-Disposition: inline

I posted photos of some LED red and green wing tip position lights here:

http://w1.lancair.net/pix/Lamina-LED-Positon-Lights

The LED arrays are from Lamina Ceramics.  These have a very wide
illumination pattern,
essentially Lambertian, and are so bright that without any lens they meet
FAA specs in the
forward direction.  The FAA specs require much lower intensity off the
forward direction, so
these lights are way over spec for other azimuths.

I just used a series resistor to set the current. Keep it simple. One amp
for the green, two for the red.

Note that the standard Whelen bulb also uses 2 amps so these create no more
heat
than the bulbs.  They make a LOT more red or green light, however.

I will attach the LEDs to the aluminum heat sinks I made with thermal heat
sink grease.

Also, you will see my strobes in the photos.  These are public service unit=
s
I bought on E-bay.
I made a toroidal lens of D shape cross section to project more light into
the azimuthal plane.
The lens was made from 1/2 inch plexiglas rod. I heated it with a heat gun
and bent it into a curve.
I then cut the cylindrical inner surface on a milling machine with a fly
cutter.

These are for my LNC2 (360), but a similar design would work for any
lancair.

Cheers.

--
Jeff Peterson

------=_Part_11469_5938447.1133224604830
Content-Type: text/html; charset=ISO-8859-1
Content-Transfer-Encoding: quoted-printable
Content-Disposition: inline

I posted photos of some LED red and green wing tip position lights here:<br=
>
<br>
<a href=3D"http://w1.lancair.net/pix/Lamina-LED-Positon-Lights">http://w1.l=
ancair.net/pix/Lamina-LED-Positon-Lights</a><br>
<br>
The LED arrays are from Lamina Ceramics.&nbsp; These have a very wide illum=
ination pattern,<br>
essentially Lambertian, and are so bright that without any lens they meet F=
AA specs in the<br>
forward direction.&nbsp; The FAA specs require much lower intensity off the=
 forward direction, so <br>
these lights are way over spec for other azimuths.<br>
<br>
I just used a series resistor to set the current. Keep it simple. One amp f=
or the green, two for the red.<br>
<br>
Note that the standard Whelen bulb also uses 2 amps so these create no more=
 heat<br>
than the bulbs.&nbsp; They make a LOT more red or green light, however.<br>
<br>
I will attach the LEDs to the aluminum heat sinks I made with thermal heat =
sink grease.<br>
<br>
Also, you will see my strobes in the photos.&nbsp; These are public service=
 units I bought on E-bay.<br>
I made a toroidal lens of D shape cross section to project more light into =
the azimuthal plane.<br>
The lens was made from 1/2 inch plexiglas rod. I heated it with a heat gun =
and bent it into a curve.<br>
I then cut the cylindrical inner surface on a milling machine with a fly cu=
tter.<br>
<br>
These are for my LNC2 (360), but a similar design would work for any lancai=
r.<br>
<br>
Cheers.<br clear=3D"all"><br>-- <br>Jeff Peterson<br>

------=_Part_11469_5938447.1133224604830--