Dive torch light head

I wanted to build a powerful dive light that didn't cost the earth but I don't have access to a CNC or metal lathe so I thought I'd see if I could 3d print one.

This is designed to house the 25W, 50W or 100W LED's that you can get cheaply from china or ebay with a 50mm reflector and 44mm collimating lens (you can buy them all from deal extreme or banggood). The front lens is 8mm polycarbonate from Bunnings (or any hardware store) and the rear is 5mm aluminium plate, both sealed by 63mm ID 2mm cross section o-rings. The battery and LED driver are in a separate waterproof enclosure of your choosing.

So far I've left this thing switched on in the sink for an hour and been for a quick snorkel and it definitely works and is super bright with a wide beam, see crappy photo. I'm yet to take it down to any depth to really test it though.