The thing about caplamps and its important for people to be aware of this is that most 'mining lamps' are designed for use in working mines and as such are designed to comply with coal mine safety regulations and standards.
Whether these make ideal lighting for recreational purposes is highly debatable. The better ones such as the Oldham DL will be designed to exclude the use of aluminium and as such have heat sinking made from expensive metals such as nickel, this being reflected in the price.
This is really as much use as a chocolate fire guard to the recreational explorer.
In similar fashion they will be designed to throw a very narrow intese beam of light which in slate caverns produces a tiny circle of light on whever its directed. This becomes an objective in iteself to the point wherby the ability of an emitter to focus into this kind of tight narrow beam is rated higher than the overall efficincy. So you end up with lamps that consume 4 watts to produce 90 lumens.
I appreciate that some people may like this sort of thing, well fair enough, their choice.
My avatar is a poor likeness.