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Hi John,
this is slightly off track however it's in the line of questioning, I
recently went and sought an instructor to learn to fly and the
guy I met (Cheif Flying Instructor) has only one eye!! to cut a long
stort short he turns out to be a commercial printer by trade and
apparently part of the trade has something to do with discharge lights
etching plate for printing! anyway he lost his eye probably through
his watching the discharge lamp do its thing for 20 odd years.
He watched this process to cook whatever it was he was making or
printing just right and a long term exposure seems to have done it
blindness trick.(actually cancer of the eyeball somewhere I didn't
ask too much)
Anyway as I'm only an electrician all I can say is the colour
temperature and for want of an understandable term "ammount" of
light thats emmited can be very harmfull to the human eye. The other
problems may be with failure to the pressure vessel and high voltages
creating a field and the stray currents causing potential problems
with human tissue and muscle.
Passing flash blindness can be irritating however the short term
exposure to UV during a dive is probably less than that recieved
driving to the dive site and given the fact that water attenuates this
may not be a problem.
This method of lighting is great no doubt about it, however theres
pro's and con's, I'd ask yourself how many dives you do and the
cost factor etc and maybe derive the fact your better off buying
your partner a bunch of flowers with the money every fortnight and get
tea in bed every morning for being the nice guy. Just a thought :-)
seeya
Bruce Stewart
At 19:52 1/10/99 -0700, John.Robinson@HS*.co* wrote:
>
>
>I was wondering whether long term exposure to the ultraviolet light
>generated by
>HID Lights is
>a problem both in and out of the water even if you don't look directly
into the
>light. Would a dive
>mask that blocks ultraviolet light be a good idea? Does one exist or can it
>easily be made. I was
>also concerned about breaking the light head and exposing the diver to the
>elevated voltages
>that the bulb runs on.
>
>Thank you,
>
>John Robinson
>
>p.s. Does anyone know the specs for ultaviolet emissions from the HID and what
>acceptable levels are
>for both short and long term exposure (a few seconds to a few decades).
>
Bruce Stewart __--__|\
bruce@tr*.co* / \
www.triton-dive.com \__.---.__/ < --about here
v
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