REFLECTOR: HID lamp cable length

[Brian Michalk]

Yes, leading edge of the canard.  It's at the very end, so forces are low.

This is not a lens that is there to protect the lamp.  I agree, it would 
be difficult to make that curve, and the optics would be distorted.  
Rather, this is a lens that is integral to the lamp and focuses the beam.

Acrylic is close to 1.5 index of refraction.  So if a cylindrical rod is 
used as the lens, the focal length is 3x the radius.  With a target 
radius of .5", that places the bulb only an inch away from the acrylic 
cylinder.  I'll have to experiment a bit.

I've ordered a handful of rods from .5 to 1" diameters to play with.  
The HID lamp should come in in a day or two.
My fear is that the aperture will be too small.

jewen at comporium.net wrote:
> Brian,
>
> Are you considering installing in the leading edge of the canard.  I believe I read on the reflector in the past that someone tried to install a light in the canard leading edge and the len's radius was too sharp and it diffused the light to the point it was not effective.  You might want to try your lamp with a lens of the canard raduis before you start cutting into the canard.
>
> Joe
>
> ---- Original message ----
>   
>> Date: Sun, 20 Jul 2008 10:07:51 -0500
>> From: Brian Michalk <michalk at awpi.com>  
>> Subject: REFLECTOR: HID lamp cable length  
>> To: Velocity Aircraft Owners and Builders list <reflector at tvbf.org>
>>
>> Andy,
>>
>> In your browsing of the net, did you find any limitations on cable length?
>>
>> If I were to figure out how to make this work as a canard taxi light, it 
>> would be nice to mount the ballast in the fuselage.
>>
>> For the more expensive D series, where the igniter is mounted to the 
>> lamp, what else is it good for?  Is that where the current regulation 
>> happens?  It seems that RF noise from current regulation would not be a 
>> significant problem.  I can see that ignition phase would be very noisy.
>>
>> I need to find a site of someone who has dissected a lamp and discusses 
>> theory of operation.
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