Yep. That’s been my favorite emitter as of late
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Other lights are usually Anduril based which is too complicated for most people. Also M21K doesn’t step down at 55C, it gets way hotter.
Nice! This’ll be my first LHP73B light. I think 5000k is worth whatever small performance difference there is vs 6500k.
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It absolutely is worth the small drop in output. I have an m21k with the same emitter. It’s great
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In the quote below I asked him if the l21b - sft-42r had the same 55 C step down and also what the output was.
Here is his answer below.
Maybe the light you reviewed isn’t in the category of “Most” I will ask him. Because I always want to know the answers!
As far as Anduril/2 goes, I am not fond of it the only thing I like about it is the ramping and the ability to set the thermal regulation. Because stock lights aren’t near 70c. Except for Thrunite and maybe a few others.
Yes I also agree that Anduril is too complicated I just need three or four modes that’s it. I only use two of them actually, very very low to cool the light off and turbo.
So it’s interesting, the product page used to have a warning about heat which lines up with your experience of the light getting hotter. But I notice now that the warning has been removed and now the product page explicitly says that stepdown occurs at 55 degrees Celcius. I wonder if a change was made. This may be potentially disappointing for me since the output I get may not match what early reviews indicated…
It indeed does have that 55c step down listed. I should have looked at the product page before I emailed him.
The average Joe probably doesn’t care I’m a full- fledged flashaholic. I wouldn’t consider a light with that low of a temperature step down. But not everybody has my preferences.
Well according to this graph, the original samples could spike to temps above 70 degrees Celsius and would respond to being cooled. If Simon has changed the driver to regulate the temperature more I would have liked to have known that before buying a light with the same driver. Maybe it can’t even sustain 2000 lumens anymore.
I’m hoping that the message on the product page is just copy-pasted from his other product descriptions, but the fact that there was a heat warning before and it’s gone now makes me wonder.
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I don’t blame you. If Changes were made there should have been notification.
I’ll let you know what he tells me. I have a strong feeling it’s 55C.
The difference between 6500K and 4000K is maybe 5%, that’s negligible.
When the driver gets to 55C the bezel can be around 70.
And hotrods from Convoy.
Technically stepdown has always been set to 55 degrees, maybe Simon decided that scaring people with burn hazard wasn’t the best selling strategy?
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The review sample was purchased by me on 31-01-2026.
I found it quite interesting how much my runtime graphs look quite a bit different compared to 1Lumen’s readings (especially temperature graphs). Not sure if there’s been a driver change.
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I asked Simon specifically about the M21K and if its step down is also 55C?
This is the answer I got.
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That’s a very nice explanation! My tests confirm this behavior:
I highlighted where the flashlight reaches 55C (near the switch) in the runtime. The Turbo seems to step down right at that moment, “High 4/4” mode seems to take 1.5 minute longer to step down (steps down at 60C).
Please remember that I measured the temperature of the host near the switch. Driver’s temperature won’t be the same.
After stepdown, you can see the temperature raises slower, just as Simon described.
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I asked Simon if the driver changed because I had seen that heat warning on the website which was later removed. He has flatly stated that such a warning never existed. I am positive I saw one. So that’s weird…
There was a warning…burn hazard?
S2+ with lhp531 still have the warning about burn hazard, similar to some of the other s models with 8 amp sft 40…
Yes, burn hazard. And I remember being surprised that this light in particular got it and not others. But then it went away. And Simon is acting like it never happened. I don’t know why he would lie so maybe the web page manager did something out of turn? idk