Re: [PSUBS-MAILIST] Under water lighting

[Dan h <machine@epix.net>]

Greg,

For an ambient sub it shouldn't be difficult to make a swivel light.  Your
pressure differential is so small that you may even be able to get an old
police light and modify it with a some epoxy and O-ring seals.  Starting
with something like that is usually easier that starting from scratch.  If
it leaked a drop now an then, what's the diff??

To calculate the power draw, it's like anything else electrical.  The
amperage is the wattage divided the voltage.
100 watts / hour of use @ 12 volts = 8.33 amp hours battery drain

Thanks, Dan H.



Gregory Snyder wrote:

> Hi Dan -
> I have the same question.
> What I would really like is one of those police lights that I can turn
> on the swivel for my ambient sub.
> Is there anything available that moves?
>
> Also-
> How do you calculate the power that you will need to run the lighting?
> Thanks-
> Greg
> -----Original Message-----
> From: owner-personal_submersibles@psubs.org
> [mailto:owner-personal_submersibles@psubs.org] On Behalf Of Dan h
> Sent: Wednesday, May 15, 2002 10:05 PM
> To: PSUB
> Subject: [PSUBS-MAILIST] Under water lighting
>
> Calling all hands!
>
> I'm working on my K-350.  It's still a ways from launch time. One of the
> many things I still have to work on is some lighting enclosures for
> under water lighting.  Most of my diving will be in lakes.  I probably
> won't be that deep but I still want to have lights.  I have read that
> some lights are better than others for lighting murky water but was
> wondering if there was a difference between what is available off the
> automotive store shelf or out of a catalogue.  I'd rather not get to
> carried away with real exotic stuff if I don't have to.  It's time to
> start planning the enclosures and I don't know what type of lamps to
> design them for.
> Is a halogen head lamp sufficient?
> How about those bright bluish head lamps on BMW's.  (don't know the
> type)
> Would they be any better or is there another type?
>
> Has anyone done any experimenting?
>
> Thanks, Dan H.