I tested the torch at Cwmystwyth over the weekend both surface and underground.
Underground, I tried it in the big stope off the first ladder and across the plank. By way, direct access to the main ladderway is restored.
It did illuminate the stope completely, however so did my batroaster caplamp due to its controlled beams. The torch is as I said, a directional floodlight, a controlled beam of lesser power is in my opinion just as good visually. The Cree XHP series was looked at by me for lamp use and discounted. For underground use I would recommend something like the Fenix TK 75, you want XML or XPL emitters behind good reflectors.
The big torch would be a handful to lug around underground as well, but , maybe useful for photography especially quick shots with people in it who are moving around.
Surface it was impressive to say the least. Real testing was spoiled by it being a misty night however.
My avatar is a poor likeness.