With a momentary switch, and a modified Moddoo clip, I will be carrying this light quite often. And I've gotta say, the ramping of this light is the smoothest I've used on any Peak light to date.
Here is a few beamshots of the Versuvius to show it compares to a few other lights that I had on line.
Peak Eiger Narrow Beam rated at 225 lumens according to Bob at em-mgt.com.
Peak Logan rated at 300 lumens according to Oveready.
Mac's Customs XM-L EDC that's rated at 575 lumens as tested by Mac.
And here's the Versuvius that's supposed to have a bare bulb output of 650 lumens. Probably has a OTF output of around 500 lumens.
As you can see, the beam is very floody. The beam actually resembles the Mac's Custom Tri-EDC. And here's a pic of the LED in moonlight mood. I could actually get the bulb even lower, but it was almost too dark to photograph.
Just one awesome light.