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The cannister has two outlets. Use one or both. There is a cap that covers the second outlet when not in use.
Output is 1000 lumens. Hence the Morph1000 name.
The heads are not wet swappable.
I use the handle that 00wabbit here on the board sells with the back up that I have.
It works perfectly and at a good price. http://www.scubaboard.com/forums/li...oodman-style-handle-dris-1000-500-lights.html
As for mounting options the cannister is designed to give you plenty of them. Rather than limit you to the standard webbing and two hose clamp system.