I've bought a 1w version, being and engineer the first thing I did was pull it apart and yes it's nice and well made. There was a finger print on the inside of the lense which I cleaned off with meths. May not be enough light for pictures but ample for finding your way about. However I've found a potential minor problem, the button isn't water tight but this is easy to solve with silicone sealant / instant gasket.
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The locking ring is only hand tight and unscrews easely with a tool, circlip pliers will be best, don't try the corner of a screwdriver blade in one of the holes!
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The obvious leakage path is between the outer case and siver coloured spacer. The spring/seal is a stiff rubber so I've decided to put sealant on this too, note : the rubber spring and spacer in the picture are upside down relative to the other componants. The sealant is blue.
Left it open for a while to allow the volatiles to evaporate.
Sorry the pictures are out of focus.
Light thinks it travels faster than anything but it is wrong. No matter how fast light travels, it finds the darkness has always got there first, and is waiting for it.