You can’t manually turn on fans at any level. Just when flashlight is off. That is sadly limits the use of the 10K level. It is better to use 22k if you don’t mind the fan sound vecause the light is cooler in that level than 10k. At 22k I measured 50°C at head after 10 minutes.
Just made a test.
10K 15 minute run. It reached 81.8°C which is a lot! No fan kicked in. But it slowly decreased output in 1-2minute steps to about 85% in 15 minutes.
Started with full battery and the start temp was 21°C
And in the glass lens center I saw some condensation after test which disappeared after cooldown. You can imagine if the head outside was more than 80°C the leds could be easily above 100°C:
That’s really nice tracking graph. It tells us how the output behave.
But I find it strange the output drop in steps, not smoothly declining. Is it due to light meter resolution?
Did the 22k lumens output level drop like that too?
The hardest thing to set up exposure same as real life. Because your eye pretty much works as between locked and automatic setting. So if you lock exposure at a low level (like 100 lumens) the levels like 5000 and above will be burned. If you set 10000 then 1000 lumens will be lower than real life. So that is why you need to compare apples to apples like I tried the MS18 with my second powerful light the MT03 TA.
The manual says 22,000 lumens for 67 minutes. It looks like it doesn’t really hold 22,000 lumens at all and drops to ~10,000 lumens at 30 minutes? Also, did it turn off at ~45 minutes? A little disappointing if so. Would you be able to test their claim of 10,000 lumens for 3hr 40min with a similar graph?