I don’t know what kind of diving are you making… I’m a recreational diver and even in my night divings, I can tell you that my live do not depends of the flashlight I’m using at all, so not a big deal if the light stop working, I switch to my back up light.
At the cost of a “well known” dive light, I can buy 2-3-4… Chinese lights taht are suitable for my needs.
Just take a look around in the forum, there are many suggestions, I got one of this, it looks like a good option at a very nice price.
It throw a nice amount of light, just change the o-rings with something better and you are done.
I also have one of this, its so cheap that I’ll buy some more for the rest of my family, the reports are good enough, the size is small, throw a surprising amount of light and for this money you can wear two or more as back up lights or even use them as primary, I have been in a night dive with people wearing less amount of light.
I do not recommend this because the front glass is not thick enough in my opinion.
4 year ago I bought this one and I’ve dive many times with it down to 30m without any trouble, you can find similar ones much more cheaper now a days, and better ones also.
Whatever you buy with 1000lm or more is well enough as a main torch in a night dive and for looking into holes and things like this.
Unless you are a cave diver or some kind of “tech” diver I think you are ok with this Chinese lights. But this is an opinion of course.
Best regards form Zaragoza.