If you can use less lumens, you can build one in about 10 minutes...
Uncertain about this application re: the OP's
3x AA request. I have found that 3x C alkalines yield blue-shift within seconds on my 5mm LED. I'm fairly certain 3x
AA alkalines will provide the same result - severe overdriving of the LED. 3X
NiMH (and their lower cell voltage under minimal loads) would work fine, but will provide only ~10 lumens or so.
2xAA would provide a number of options re: the inexpensive multimode low-voltage dropins such as SolarForce.
There really are very few adequate solutions for what the OP is looking for, aside from the Malkoffs. :thinking: