Looks like a great light.
Also, a little bit of effort would allow the batteries to be
by-passed by one of those extra transformers we all have around from
an old cell phone charger or AC adaptor for one of the many
electronic devices that we threw out a while ago. Most of these are
marked with the output voltage and it should be easy to match one to
that of three AAA batteries.
LED have a life of tens of thousands of hours and should have a wide
operating range as far as voltage is concerned. Even if rigged up to
a transformer with less than ideal amperage, the life should be very