Cannister Light

[shuky]

Those switches won't work unless you plan on using a very low wattage bulb. The current rating is not high enough and you will fuse the contacts making it always stay on, unless you add a relay or a high power mosfet. I'd recommend looking for some other switches or something with an integrated relay. Magnetic switches (reed switches) are very rarely found over 1 or 2 amps and would be expensve and bulky. These switches might work for a 10W HID bulb, but the initial surge current could destroy the fragile reed contacts.

you could use a relay to carry the load of the bulb, while the reed switch only operates the relay coil - very low current on the reed switch.

 

[Skinah]

Have a look at this DIY canister light as you or others may get some ideas from it...


http://www.pcmus.com/Dive-Photos/Dive-Light-DIY-SCUBA.htm

The electronics removes the need for any relays and allows the use of reed switches as well as giving lots of extra features and longer burn time to your light.