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What does HID stand for?  Is it something like "High Intensity
Discharge"?  It sounds like the output spectrum is narrower than an
incandescant lamp, so it produces more useful light for the same
lumens.  Does it focus better than an incandescant lamp?  If the spot
size is smaller it should focus better.


kirvine@sa*.ne* wrote:
> 
> Mags, I use an HID light run off of my nicad canister. I use removeable
> HID heads which are interchangeable with regular heads on the underwater
> conectors. I keep two diferent wattagges in my pocket so if the HID
> blows, I have a low power normal light to travel on, and can go to the
> normal power to explore without bagging my batteries.
> 
> My particular HID draws 1.8 amps, so lasts 13 hours with my nicads. On
> JJ's Barry Light pack it lasts about 9 hours, and on a normal Barry
> Light is lasts more than five hours.
> 
> The HID is putting out the far blue end of the spectrum which is not as
> well absorbed by water so you can "see" farther than with a lower color
> temp, or longer wavelength light. This is like the effect at depth where
> with no light you can only see the blues which penetrate to that depth
> due to their higher frequency/shorter wavelenght.
>

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