This is a review I wrote for a reptile conservation group I belong to called Herp Conservation Unlimited. The review was catered more to a portion of the audience that isn't as savvy with regard to flashlights as most of the people here. I thought it might be helpful for folks here too though.
The new Fenix lights are in. I ordered the new TK11. I really like the new body style. It's better on ergonomic and engineering levels and also in the fact that it's bored out to accept 18650 rechargeables. The color temperature's more neutral than my cool TK10 and I like that very much. It's got two brightness levels like previous T-series models with 225 bulb lumens on high and 60 bulb lumens on low.
The reflector on the TK11 is smooth. It's designed to be more of a light thrower than the "floody" TK10. The smooth reflector does show some pretty distracting circular artifacts that the orange peel reflector in the TK10 does not. I tend to prefer the floodier lights so this may not be distracting to and may even be preferred by some people.
Reflectors of both the TK11 (left) and the TK10 (right):
Beamshot of the TK11 - neutral tint, but with some slightly lopsided concentric circular artifacts due to the smooth reflector:
Beamshot of the TK10 - a cooler, but softer and more floody beam with much better sidespill (hard to appreciate from the photos) and a soft-edged spot:
It's important to note that the color temperature of LEDs typically varies between and even within batches. Although my TK11 is more neutral and my TK10 more cool, it's entirely possible to get versions of each light with cool, neutral, or warm (more unlikely due to the nature of diodes) LEDs.
The 200m throw of the TK11 may be better suited as a vehicle-based herping tool, while it's brother the TK10 would be more suited for field herping (although it's excellent for longer distance purposes as well). I put a call in to Daniel at
Fenix Outfitters to see if the TK10 and TK11 heads are interchangeable so that the capability of using rechargeables could be conveyed to the fabulous floody TK10 head. I'll let you know what I find out.
Update: the heads for the TK10 and TK11 are not interchangeable due to the 18650 adapted circuitry of the TK11
One thing's for sure... no matter which of these two lights you prefer, you can find what you're looking for with either of them.