Hi there,4-6000lm its definitely not(in standard form anyway) the output .I have a couple and both are the 3xled versions. They are not as bright as my tm15 at 2450lm although admittedly the reflectors are more shallow(floody)on the SR.
Bang for buck imo they are pretty good value,like a cheap version of the tm11 in a little way but certainly not a replacement. Would guess at each led around 500-600lm tops so around 1800lm ish on my versions. I dont think the versions with 4 or 5 leds have different drivers so probably driven less per led(dont know on that) just a guess. As its hard to know the facts,so many make/sell clones of clones of........... there are lots of variations in build and no doubt output.
The 4 led version is not up to tm26 in anyway,build,performance etc but for around $40 its a good budget option.
Claims wise ignore but my china light guide :laughing: , in general i use around 3-600lm tops per led as a guide with the leds used on these lights as almost all are exaggerated to sell .
Obv modded and driven hard versions can reach and surpass those figures .......................