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I bought the light at Amazon for $17.99. It's a Kawell 12 watt flood beam, and it pulls about 1.5 amps. I used two 25 lb magnets. (the light is cast aluminum and is pretty heavy for as small as it is)
I couldn't decide what to do about a switch....so I used some redneck engineering for the time being, until I decide what switch to use and where to mount it.