minimag 2aa --> lifetime of
5-7 hours continously (thats 1-1.5 sets of batts
at max) for every bulb.
when burnt out, the bulb is grey/silver from the inside
that was and still is a light for very occasional use, noone owning one, really used it a lot
(because then the lifetime of the bulb would keep these "real" users
from grabbing the MM)
PS: I think I have gone through 20-30 bulbs in my life of MM-using. The short lifetime was the main reason not to take the MM any more, when the led explosion started.
The other reason was the light switchig itself on when pocketed
PS:
pink ring = brighter, no change in lifetime
blue ring = indication for smaller, less powerful, other voltage solitaire bulb