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The lights are ready to fit.  I have purchased an aluminium heat sink box off ebay and am going to mount the 3 voltage converters inside.  The box will then be mounted to the inside of the hull.  Hopefully this will dissipate the heat adequetly.  If it gets too hot I can always modify things, such as pot or oil compensate the box and mount it outside in the water.  Needs experimentation but I think it might be ok for now.

Just one thing worth noting.  The voltage converters almost fit into the torch handle and I think with a bit of filing of the converter casing and persuasion, you could get the light and controller into 1 unit, all mounted outside in the water.

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