The Victorinox lights are built by Inova. Therefore their construction is quite sound. Unfortunately Inova chose absolutely terrible emitters for their 2007 product line. In this case the 5.8W LED is a Luxeon K2.
Now I don't own one (due to the use of the K2) so I havne't been able to test the current draw at the battery or at the emiter. I would suspect that it is not actually pulling 5.8 watts. Inova has been listing the max rated current of the emitter, not what it is actually running.
I'd guess around 80 lumens is what the emitter is putting out, not what you'll be getting out the front. Inova has been quotingemitter lumens for the past few years and I doubt they're going to change for now. I've played with one in the store and I was not impressed with the output.
The construction and beam pattern are quite good though. I've seen them for sale at Brightguy if you'd rather buy from a reputable dealer.
Hope this helps and doesn't turn you off to the light. It is a great light that simply can't compete very well in output. There are things beyond output. This is a rare C cell form factor light that would likely make a great host for a Seoul mod if you can get to the emitter.