[photo-3d] Halogen viewer bulbs

["John Goodman" <jgood@xxxxxxxx>]

At least three "types" of halogen 2-cell viewer bulbs are 
commonly available (from Steve Berezin, Dr.T, and other 
suppliers):

2.5V	.50A
2.5V	.83A
2.8V	.85A

I asked a dedicated bulb supplier (Reflectalite) about the latter 
two "brighter" bulbs, and a gentleman there said:

> 2.8V 0.85A are the same or virtually the same bulbs as 2.5V
> 0.83A expressed at a different voltage.

I'm too much of a nitpicker to be comfortable with "the same 
or virtually the same."  :>)  In any case, the ratios of the 
voltages and amperages don't agree.

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?

jeg

 

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