REFLECTOR: Landing light

[Jack Prock]

The GE 4509 is the same light used in the Grumman. Many years ago, I heard
that if you install the light
with the filament vertical, it will tend to last longer. I guess it is
supposed to handle the vibration
better.  I tried this and it seemed to extend the life...my imagination?
maybe, but it doesn't hurt.

Jack

----- Original Message ----- 
From: "Scott Derrick" <scott at tnstaafl.net>
To: "Velocity Aircraft Owners and Builders list" <reflector at tvbf.org>
Sent: Saturday, November 17, 2007 1:09 PM
Subject: Re: REFLECTOR: Landing light


> If you want a landing light that is truly brighter by orders of
> magnitude and lasts as long as your airplane, get a Xenon HID gas
> discharge....
>
> Scott
>
> Al Gietzen wrote:
> > Some further research suggests that the claims made for the Q4509 are
> > largely bogus in the reality of actual use, and result from the way they
are
> > tested. A good expose' is at
> > http://www.cessna120-140.org/forum/files/landing_light__q4509.pdf
> >
> > In summary, the actual increase in light produced is about 27% (the Q is
> > narrower beam and bright at its center) and, although the lifetime is
> > longer, most likely not as much longer as the factor of its price;
> > particularly if you leave it on for long periods during flight as a
traffic
> > alert.
> >
> > FWIW,
> >
> > Al
> >
> > -----Original Message-----
> > From: reflector-bounces at tvbf.org [mailto:reflector-bounces at tvbf.org] On
> > Behalf Of Laurence Coen
> > Sent: Friday, November 16, 2007 9:53 AM
> > To: Velocity Aircraft Owners and Builders list
> > Subject: Re: REFLECTOR: Landing light
> >
> > The primary reason the Q4590 lasts longer than the 4590 is that it can
> > tolerate vibration better.  It also takes the same power and is twice as
> > bright.  The main source of vibration is from the engine, not from the
> > ground roll.  Since the engine and landing light are on opposite ends,
the
> > lamp should last longer on a Velocity than say a Cherokee where it's
mounted
> >
> > on the lower engine cowling.
> >
> > Larry Coen
> > N136LC
> >
> > P.S.: Remember that this is free advice and worth every penny.
> >
> >
> >
> >
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>
> -- 
>
> -
>      I would rather be exposed to the inconveniences attending too much
> liberty than to those attending too small a degree of it.
>
>      Thomas Jefferson to Archibald Stuart, 1791. ME 8:276
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