Running a 1~3w lux from an AA-cell it not impossible, but you would have to find the circuit for these. These are being offered in many lights, but intil now, no one has been able to sell these inividual boards to the public yet...
You might be better off with a 1 cell (R)CR123 config, which is my personal favorite.
Is this light worth modding ? Not sure... If you wanna go cheap, you can get a new Lux, or even Cree light with more brightness and throw for less then you would pay to mod this light... It all depends on personal taste and if money is an issue or not...
I had a "Smarfire" 2x123 5W led light. One of the cheap ones.
However, I did like the form-factor and the body-shape...
It also had a star, so I just replaced the Lux-Star with a Cree star.
I don't use the 2x123 config, but run it on a 17670 3.6v cell.
The Cree is well-sinked and runs Direct-drive. These is place for a regulator
board, but not yet sure if it's worth it... I can always remove the star
from the light if I need it for something else... The light had a resistor,
which you need to bypass to run led in DD...
Cheers man !
2x123 model...
This is the 3xAAA model, however, the rest is similar.
Notice the replaceable star...