My impressions of the Toxic Green Preon P2.
Firstly, the light looks awesome. Nice and thin, good feel on the clicky and GREEN! In comparison to the P1 version, Foursevens have decided to increase the brightness on modes rather than the run time. This is pretty good, though a little annoying on the low mode as it's pretty much the same brightness without any gains in battery life. There's no moonlight so maybe don't use it in a cinema or when you don't want to wake your partner, but it's quite good for a general low mode to be used when it's actually dark and you need to see. Current draw at the tail cap is about L: 60 mA, M: 250 mA and H: 850 mA from 2x Ni-MH. The beam is pretty clean with a nice cool white tint. It has PWM, but it's pretty good - not noticeable in usage and it doesn't mess with my phone's camera. The hot spot is pretty nice and floody due to the reflector, making it great for the up close tasks you'd expect.
There's no memory, which I like. It starts off in low and you just increase it with half-taps, so you'll know what's about to come out of the light.
It gets warm on high after a short while. By 5 minutes it was at ~40 degrees C. By 10 minutes the head had reached 45 degrees C. The body takes some of this heat and had approached 35 degrees C here. It was just sitting on the couch here. Quite warm to hold but not painful for anything. I'm sure holding it during actual use would heat sink it quite a bit more. By 15 minutes it seems to stay around 45 degrees C. I'd say the long aluminium body is good for heat dissipation. I'd been using it for a while by then, but the brightness dropped (so potentially just due to battery depletion). The batteries were at 1.22V or so when I started the heat test (with a bunch of use beforehand) and were on 1.14V when the brightness dropped. So when the battery is low, high defaults to medium. Once I turned it off, the temperature rapidly drops.
The special modes are fun and decently hidden. I especially like the way it notifies you of which beacon mode you are on (high or low) by flashing an interesting pattern before starting the beacon flashes.
The downside, it feels a little long. The maximum 192 lumens is noticeably brighter than the 100 I get from my shorter E99 Ti, but that doesn't provide a critical difference at a short range (~10 metres). It's not a very noticeable size difference if clipped to the inside of a pocket, and actually feels better to hold in the hand. I feel as though the P1 should borrow the clicky interface. If I didn't want this one to remain pristine, it would be the best light to leave clipped on my lab coat.
If you carry your light in a bag, it would be perfect for the penholder loops. I don't know about durability yet, but one problem I noticed was that after having it on for 1 minute in the heat test, a slight tap on the side turned it off. I turned it back on immediately without problems and I couldn't get it happening again. However, I've had a similar problem in the Atom AL. I'm hoping it's a one off problem (it certainly seems seems like it).
I really like this light. It's a smooth little puncher. Thanks to Doc and FourSevens.
EDIT: On freshly charged batteries it does push it a bit further

EDIT: When clipped to the inside of my front left pants pocket, it turned itself on a few times. This may kill your battery, but it may not do this with you.