I believe that some of the Eternalight torches have various brightness settings, as well as various flash/sequence and strobe combinations.
There are also some torches fitted with AOM mode which keeps the LED on very dimly even when the torch is "Switched Off", This function allows a torch to be found in total darkness and is a function appreciated by cavers and campers. The current is usualyy very small, sometimes a few 10's of uA will be enough to produce a visible glow in today's high efficiency LED's!