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FOLOMOV made a few changes with the new version (5000K) of the 18650s. The biggest change is indeed the 5000K tint which is still in the neutral range. The threads on both ends of the tube are now finer and square cut. (Old threads are slightly courser and V cut). The color of the body is not black. I would describe it as a silver gray brown titanium with just a bit of a sheen. The instructions now state that when the battery is less than 10% “turbo,high and medium levels will not be available progressively.” What happens on mine is somewhere around 3.4 volts turbo does not work and as voltage drops further high and medium become unavailable. With a different battery at 2.6 volts I was able to switch between the two lowest modes and turn the light on and off with the switch. And I was able to switch to tactical mode which utilized the second-lowest mode. (I’ll go over low voltage on the 3000k model further down)
During the following test the original 3000K was running about 10F degrees hotter so the temps I mention are for the original 3000K. I ran them both on turbo with identical Wowtac 3400mah batteries at 4.15v for a few minutes and then quickly clicked them off and back on and temperatures can climb up to 130F . After one more minute and a quick off and on (still on turbo) temperatures climbed to over 140F. Cycled again after another minute I did see that strange blue light and I immediately shut it off at approximately 150F. The 3000K instructions did not talk about low voltage. Folomov website does state that only the two lower modes will work and the switch will not turn the light off below 10% battery. The reality is that happens somewhere just below 3.4 volts. So you must unscrew the tailcap to shut it off. You can turn it back on, but you can do nothing else with the switch below 3.4v. Both the old one and the new one have very sharp edges on the holes for the lanyard. That’s not too hard to fix using a small file or other sharp tool to scrape off some of the anodizing and chamfer the corners. At this point I much prefer the 3000k tint. I will continue to carry both of them for another few weeks to test them under various conditions and uses. Edit. the above stress test was done in the name of science because of all the complaints of overheating. Only when refreshing turbo do I have temperatures get above 120F.