Mark,
If I could get my hands on 24V stuff, I would not hesitate. I would run
the nav lights in series, rather than parallel.
As a matter of fact, my current setting is series mounted. I use 12V/20W
halogen bulbs. Way too powerful for nav lights (they tend to mate he
Perspex brittle), but in series, they work great.
Serge Vidal
KR2 "Kilimanjaro Cloud"
Paris, France
"Mark Langford" <n5...@hiwaay.net>
Envoyé par : krnet-boun...@mylist.net
2005-04-29 14:16
Veuillez répondre à KRnet
Remis le : 2005-04-29 14:15
Pour : "KRnet" <kr...@mylist.net>
cc : (ccc : Serge VIDAL/DNSA/SAGEM)
Objet : Re: KR> LED's revisited
Kevin Jarvis posted (from somebody else):
> Hey All, please be advised. We had an RV on the field that was denied
> > > Airworthiness because of LEDs. It is not universally excepted by all
DAR's.
> > > I like the look and the power consumption but DAR used a luminosity
testor
> > > and it did not meet lighting requirements. Im just the messenger.
Buyer
> > > beware of sales pitches.
That is interesting, as I have a set of those very LEDs that the RV crowd
is
using, but I already have my airworthiness certificate. I talked to the
Whelen guy at SNF, and he showed me their new line of 24V LED nav lights,
and even LED "ground recognition lights" (beacons). The problem is that
they don't have 12V version yet, mainly because of the logistics of
dumping
the extra current (as heat) out in the light itself. I asked "why not put
the power pack in the fuselage and just run wires to each tip", but he
said
the numbers just aren't there for the experimental market, and these are
designed for particular planes, and the wiring that comes along with them.
I don't think he's seen the numbers on where all the new GA aircraft are
coming from though! Perhaps he meant the $ numbers, but it is entirely
possible to do, because Whelen has proven it. (See
http://aviation.whelen.com/catalog/LED%20Lighting.pdf ). I remember several
folks posting that they had done it in the last few years, and by
appearances, the LEDs were far brighter (and burned less current) when
placed right next to certified nav lights. I'm still going with LEDs,
myself. Knowing what little I know about electricity, I'd say there's no
reason that it wouldn't be sufficient for 12V to use exactly the same LEDs
that Whelen is using, in the same configuration, but a solid state power
supply in the fuselage.
Mark Langford, Huntsville, Alabama
see KR2S project N56ML at http://home.hiwaay.net/~langford
email to N56ML "at" hiwaay.net
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