Flashaholics, thanks for testing it out again. Was this 84c at 10th minute or shorter time? I think it is reasonable fan started later than first test since it is colder to start from.
I started measuring from about 6 mins, 81c to 84c over 3-4 mins etc, heat doesnāt go up that fast once the stepdown occurs. I donāt know if the fan is keeping it stable at 15,000 or the sheer flashlight size.
If we look at Mattās video review that he tested at just 15000lm, temperature was still increasing after 20min where it reached 70c, also output was dropping gradually to about 11000lumens in the test, I think itās mostly due to output drop and sheer size of mass, the fan does not help much.
By the way, do you feel obvious hot air flow during your test?
So they build a light that blinds you with the spill reflecting on the ground, and then they forget to research how you implement a fanā¦
The bit of airflow outward gets immediately sucked back in by the inlets, apparentlyā¦
Ya, i think this one can really cook, 80+ degree celcius external temperature can really cook something. Wonder what would be the internal temperature. :question:
I was thinking this morning could it be the fan spinning too fast compared to prototype. Donāt know why Imalent engineers can accept this kind of active cooling with minimal airflow?
hm where does all those hundreds of watts heat go then? makes no senseā¦. If hot air just is trapped inside that light will not function well in the long run. That much heat must vent and go out and not stay trapped, its like a furnace in thereā¦
Like i said there is a reason olight and now acebeam ditched the internal fans, i doubt imalent have made anything groundbreaking with that fan? it doesnt sound so atleast too meā¦
Heat can be transferred from one place to another by three methods: conduction in solids, convection of fluids (liquids or gases), and radiation through anything that will allow radiation to pass.
So now it has conduction from mcpcb to light head, and radiation from light head to surrounding, but not much convection due to ineffective fan design.
Basically all non-active cool flashlights donāt have much convection unless user blow an external fan on the flashlights. MS12 supposed to make use of convection to transfer heat away with air.
Right, all flashlights use convection (unless they are in a vacuum), but itās relatively weak. Using a fan is called forced convection. It greatly speeds up or helps the heat transfer.
Even though other MS12 users show air entering one side and exiting the other, itās not a straight forward flow. The fan style they are using just seems odd. Iāve never seen that style of fan used like this before. The only thing close was the FB1 below.
In fact, here are all the airflow patterns on the active cooled lights I know of.
The prototype Olight X9.
Iām guessing on this Microfire due to lack of data.
The protoype X70. It had 3 fans so it looked like it had 3 dividers using 120Ā° of the diameter. So it had 3 inlets and 3 outlets.
The new version of the X70 has the external fan and ālooksā like it has air blowing across the exterior.
I am still guessing on the MS12 design. Their fan style and layout is very odd. Iām guessing they are using a divider to get the air to go in one side and out the other, but itās not working very well.
Used in laptops a lot.
Itās a centrifugal fan. Picks up air in the centre and blows it out the outer perimeter.
It basically spins the air thatās in there and flings it outward.
Very effective.
Vacuum cleaners work that way too.
You misunderstood me. Iām familiar with all fan types, but centrifugal is not often seen inside flashlights. The FB1 uses a centrifugal, but itās orientated differently.
Yes the type of fan in the middle of the light makes no sense to me, it doesnt seem like its magical just sucks the cold air from one side and throws out all the hot air on the other side, if it was that easy other light makers would have figured that out long before imalent, it doesnt take a rocket scientist to figure that out.
Would be interesting see the inside of the head if there are air channels or something to get the flow out somehowā¦
Imalent should be held responsible if this flashlight burn someone accidentally. To be king of lumen it must also take care of user safety. I canāt imagine those who has less flashlight knowledge paying full price and get themselves a dangerous tool. If buyers think MS12 gets too hot in such a short time and request return for refund, would Imalent accept return? Sport car that can accelerate very fast will also brake to still very fast, itās safety that is utmost important.