I own the Convoy S2+ 365, and while the Nichia LED is rated at 3 W max, in the Convoy it is driven at around 750 mW.
When holding the light close to your hands or lips, you can feel quite a lot of heat coming from the LED. The head will get warm after running a couple of minutes.
The LED itself gives off a faint deep blue glow, and unless the UV hits something fluorescent, you'll have a hard time telling if it's on or off, especially in reasonably lit places.
When the UV hits something fluorescent, you'll be surprised at the brightness of it, and only then you'll start to realize how bright it is in UV.
At around $25 or 22 euro, this is the best starter UV light you can get.
But don't forget: It runs on 18650 batteries.
And as Redvalkyrie said: This light is perfect for spotting filth in your house.
I once read a story about a guy who bought an UV light while staying in a hotel, and after he tried out the light in his room, he slept that night in his clothes on top of the bed covers.