....They were specifically designed for special forces/military, so it should stand up to 10 ft. of water easily.:thinking:
Just because something is marketed as "tacitical" doesn't mean it can survive water submersion over a sustained time.
Its dangerous to assume that, and it miss-leads the OP... without actual testing or first hand user accounts to back it up. No where on the pentagonlight www site do they specify it is capable of sustained submersible water resistance.
The poster above makes a valid point in that water pressure and vacuums surrounding a submersed object varies depending on whether it is stationary or in motion. So at 10 feet its going to see more pressure variation when in motion.
I made my post above, urging the OP to just try it out since I am very confident no one has any first hand experience using these lights submerged. Theres no harm in pulling the cells + module and giving it a dunk to test it first.
There is a REAL safety concern here, since we are dealing with Lithium cell chemistry combined with high current draw from an incandescent LA. To suggest the OP go ahead and swim with it without having him validate its water resistance first is (literally) playing with fire. If that light were to take on water, he could end up with a pipe bomb 3-4 inches from the family jewels.
In light of this (no pun intended) I still think the OP is better off buying a dive-rated light.... Just my opinion.
**edit**
Product link here...
http://www.pentagonlight.com/item_detail.cfm__id.315