I bought one a month ago. Took it to T&C. We did four night dives and it was the 2nd brightest light on the boat. (out of about 15) - the only brighter light was a 3LED 8D-cell Princeton model.
It threw a nice even beam. One night when it was a little cloudy I could see the beam pattern clearly - it sort of a gradually spread to about 10-15' wide at about 60'. I also used it to light up stuff so my buddy could film it u/w. It's more of a blueish light than some others.
On one clear dive, someone commented that they could see by my light on the bottom everytime I checked my computer during my safety stop - I have a Gekko so no backlight. Others commented on how bright it was and I was asked where to get one.
Used the same batteries all week. So I'm only about 1/2 into the 8 hr. claimed life. The light output still seems as bright.
Well constructed also, it's a solid aluminum body that seems like it will stand up well. The connection between the lanyard and the light body hole is a little weak - it's nylon thread - why Piranha includes the free cave line.
In case you weren't aware of it, the Penetrater is actually made by Dorcy. It's their model 41-0467:
Dorcy International - Flashlights, LED Flashlights
I bought mine from Piranha, they shipped fast at a better price than Dorcy Direct.
For comparison, my buddy uses a UK C4 eLed - he mentioned my light seemed brighter. And I have a SL4 eLed bought last year - this light is definitely brighter - maybe twice as bright - I compared them both on one dive.
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