Partially quoting myself from a similar thread...
There's a big factory in Shenzhen that turns out tens of thousands of good quality all-metal dive torches that get resold under a bunch of different names. Resellers can specify certain options, but there are only a couple of basic variations.
IMO, the basic body you want is the one that uses 3 o-rings, a rechargeable single 18650 battery, and a Cree XM-L2 LED. They are usually advertised as 1000 lumens, although DGX rates their version at a more realistic 600. It's really bright, so much so that I'd look for versions with one or two low power settings. On night dives in clear water, I don't use like to use the high setting for anything other than signalling.
I'm not sure who retails these in Italy. In the US, they've been sold under names like Volador, Brinyte, Securitying and Nitesun. And of course, the DGX600 lights. I also think the Mako light from the first page of this thread is one of these.
I recommend looking for one that has a forward mounted button (rather than twist or tail mounted), a battery indicator which is usually a ring around the button that turns from green to red, and multiple light levels.
I attach a bolt snap and carry it clipped off to the right chest d-ring unless it is in my hand. Instead of a soft handle or lanyard, I wear one of those rubber cause bracelets and clip on to it when I take it off the d-ring. On a night dive, I clip a second one into the left chest d-ring.
Edit: found a picture
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