Voltage range of KL6?

I have an M3 that will be on its way to me in a few days as soon as the seller gets the money, and I am already considering buying a KL6 from lighthound. Great price of around 100$. I believe I once saw on McGizmos modded lights website an L6 with its body cut down to accept only 1 CR123 and I think he might have said it was stock and ran great with only 3V. Is this true? If I were to buy a KL6, would that mean I could use it with 2AAs when 3xCR123 are not available? (with some battery rattle, but really useful nevetheless)

Don changed out the driver board and replaced the Lux V with a Lux III:
http://dmcleish.com/CPF/LFB/index.html

Dangit... Well, what is the highest voltage it accepts? 12v?

The original configuration called for 3x123, but with the BadBoy 700, I think it can only take a single 123 cell.

Surefire's website states you can use the KL6 on the M3, M3T and the M4. So I guess you can say 12 volts before any load.