Just a comment on the switch since it might not be obvious:
It is a reed switch. The plunger is machined out of aluminium but it contains a very small magnet in it. The magnet is sealed inside the aluminium plunger with epoxy. The plunger is anodised and held in place with a SS spring and a SS...
Just a comment about the 'lumen' ratings:
Everything WRM said is right, but the article he linked is actually a year old and the technology has moved. We make very small batches of these torches so that we are never more than a month away from using new LED technology.
The current (standard)...