REFLECTOR: Landing light

[Scott Derrick]

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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liberty than to those attending too small a degree of it.

     Thomas Jefferson to Archibald Stuart, 1791. ME 8:276