REFLECTOR: Landing light

[Al Gietzen]

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.