The full review is available here
English review at BudgetLightForum
German review on my website
Summary
The Nitecore EDC23 flashlight has been my everyday companion for a few months. The Nitecore EDC29 is the perfect alternative when more light is needed. The two UHi 20 MAX LEDs are not only quite bright at 6500 lm, but also produce a wall of light in Lumin Shield mode. I also like the great UI with two buttons and the “Rapid Lock” lockout using a slide switch.
Given the compact design, it is not surprising that the flashlight heats up quickly and cannot maintain the high brightness for long. In the lower levels however, the constant current driver keeps the brightness pretty constant. Unfortunately it is not possible to choose freely between the wide and narrow beam for each brightness level. The permanently installed rechargeable battery can also be seen as a disadvantage.
It was probably an EC4 if you're really thinking of a nitecore. I have an EC4SW and still love/use it.
I think it was the Fenix TK35 or some variant. I paid more attention to Fenix than Nitecore back then.
I remember looking at the TK35. Those two have a very similar form factor. I remember going for the Nitecore EC4SW because it was a floodier light.