There was some discussion earlier about the nature of the fuel for the
 lamp.  Although it is explicitly battery operated (see vending machine!),
 It was generally assumed not to be a conventional torch/flashlight. 
I always assumed it was an electrically powered lantern (one game
described it as a 'brass lantern' IIRC. In other words electrically
identical to a nromal torch/flashlight, but mechancially different.
 Well, a friend knew that I was in need of a better power failure light,
 and gave me a lamp.   It looks like an ordinary "hurricane lantern".  But,
 instead of combustion, it has more than a dozen LEDs!  The "fuel tank" 
Colossal Cave and Zork long poredate whtie LEDs :-)
  has a door on the bottom for batteries.  What appears
to be
 a liquid fuel tank cap rotates, and is actually an ON/OFF switch and 
They should have had a little rod coming out the side below the glass
part for that, like the wick adjustment on a real huricane lamp.
  dimmer control!   I'm not used to seeing
reasonably smooth dimming with
 LEDs. 
I would assume it varies the mark:space ration of a drive waveform. Have
you dismantled it to see what's inside?
-tony