if you want the links discussed on the podcast, here it is:

http://www.egpworld.com/hp/trigger/Default.htm

http://www.cuscadi.de/2012/10/08/mehr-nanos/

https://play.google.com/store/apps/details?id=com.vito.lux&feature=search_result

Each of the following animated gifs shows 2 side-by-side beams from 2 different 4Sevens Preons on low/med/high and the caption below indicates which beam is which:

1-AAA NiMH/2-AAA  NiMH

This is to be expected. The 4Sevens website states that the Preon 2 more than doubles the lumen counts of the Preon 1(70 lumens to 160).

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 1-AAA NiMH/1-10440 Li-Ion

Again, this is to be expected. We are comparing a 3.7v battery to a 1.5v battery.

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 1-10440 Li-Ion/2-AAA  NiMH

This is where I got excited. Not really surprised, but excited that a single cell could so obviously outperform the 2 AAA batteries.

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In Conclusion:

My completely unscientific comparisons found the Preon 1 with the single 10440 Li-Ion battery to be brighter than even the Preon 2 with two AAA NiMH batteries. How much brighter should be measured with a scientific instrument, but I would definitely believe that the Li-Ion Preon 1 is 40+ lumens(25%) brighter than the NiMH Preon 2. It is pretty cool to have access to so many lumens in such a small package.

The batteries used in this comparison were AAA Samsung Eneloops and ICR 10440 350mAh batteries.

The 10440 batteries can be purchased from Super T Manufacturing.

The Samsung Eneloops were purchased from Amazon.com.

Purchase the Preon 1 from Amazon.com for $35

This is not an endorsement for Li-Ion in the Preon and this is not recommended for an EDC setup. The Preon head heats up very quickly and could cause damage to the circuits. Your light will no longer be under warranty.