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Re: [photo-3d] Halogen viewer bulbs

  • From: "Dr. George A. Themelis" <drt-3d@xxxxxxx>
  • Subject: Re: [photo-3d] Halogen viewer bulbs
  • Date: Mon, 12 Mar 2001 04:51:30 -0500
John Goodman writes:

>2.5V	.50A
>2.5V	.83A
>2.8V	.85A  [...]

>So what's the story? Wouldn't the bulb with the manufacturer's 
>lower voltage rating provide a higher color temperature 
>illumination and a shorter lifetime at the voltage delivered by 
>two (alkaline) batteries? Is the difference really negligible?

I would do my own tests to answer this, instead of
relying on the manufacturer's specifications.  I would
derive a voltage/current curve for each bulb by increasing 
the voltage and measuring the current.  It is quite possible 
that the bulbs have nearly identical curves, with 2.5V/0.83A
and 2.8V/0.85A being two points of this curve.

George

 

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