The Gen 2 arrived today and to the untrained eye they are hard to tell apart.
I won't go so far as to say I don't like the Gen 2 and understand why Pelican made the change in beam texture spread those extra lumens over a broader area. But I do prefer the old way of beaming out photons on the 100 lumen Gen 1 in a pencil beam'd thrower. It was a treat to aim the little light into a small area like a narrow pipe and cast those not so white lumens forward some 75 to 100' without a bunch of side spill causing close up use to cast a bunch of reflected light back at me.
Yet the Gen 2 is much better suited as a general purpose light that runs off 1 double A. And according to Pelican, a lot longer than the Gen 1.

You can see the change by looking at throw and CD numbers.
But Gen 2 weatherproof is a vast improvement as well.

Bodies are identical.
Like Maglite, Pelican has picked a style and stuck with it. Bravo imo.

I did a stripe to know at a glance.

Hard to spot the new vs old.
The left is the Gen 2 which has a slightly larger "die" (is that what it's called?... that yellow thing under the dome)

Hard to meter but spot to spill is much better with the Gen 2.
If you want to call it a ratio the blend of bright spot to outter spill would be a much smoother ratio. Great for general use, where I use the Gen 1 as a niche light in my tool belt of lighting.
Being able to easily program is a boon. Half press X number of times for high only, hi/lo (no strobe) or lo/hi... or back to factory hi/strobe/lo. Unlike Streamlight ten tap the pelican way is say... 8 for factory. Half press 7 times and hold #8. Light flashes once to say "tadah". 10 gets you high only with 2 flashes. 12 gets hi/lo with 3 "tadah" flashes, 14 and 4 for lo/hi.
I like Pelican products so it didn't take much water to float my boat. And this one using a 50¢ easy to find fuel cell should make it a big seller for them.
I bought 3 Gen 1's knowing they'll be gone soon. Cannot say I'll buy another Gen 2 unless it's for gifting this fine little deal as anybody receiving it will likely find it a very useful little flashlight.
Edit: dark out now;

The pencil beam.
Note how dimly lit around the beam. Not a great general use but throw is amazing.

Huge difference.
One of the few lights I own that appears a lot brighter in general use than it's previous version, yet not even 80% more output.
One of the many reasons Ima Pelican lights fan.