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Regarding the magnetic reed switch, make sure that the switch is rated for
the current it will be handling.  I designed an underwater light for US
Divers years ago and soon found out that if the switch is not rated for the
current, it will latch - you cannot turn off the light without disconnecting
the battery.  Also, a mercury wetted magnetic reed switch will help prevent
latching.

Good luck on you endeavor, but I also suggest you price the project up front
and compare the cost of purchasing an off the shelf light.  PVC pipe will
have the strength to resist pressure, it's the seals I would worry about. And
there are other issues like recharging batteries, venting etc..

Mike Borrello
mborrello@ao*.co*

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