Imalent MS12

3rd test at full voltage yielded hot measurements again this was this morning when it was very cold too. 84c head, 56c side of button. Turbo stepped in at 3 minutes though, but the light was very cold at turn on.

I’ll have to do a 4th 10 minute run time test at lower voltage again lol.

The fan does seem to hold the temp once it’s stepped down but it’s at temps that’s too hot to hold without gloves. It might be best running it on the lower modes first before sustaining turbo.

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.

Another great “budget” light!

I started measuring from about 6 mins, 81c to 84c over 3-4 mins etc, heat doesn’t go up that fast once the stepdown occurs. I don’t know if the fan is keeping it stable at 15,000 or the sheer flashlight size.

If we look at Matt’s 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 it’s 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?

I felt zero air enter or leave the light.

:open_mouth: Looks like Imalent successfully design a mini convection oven, in wrong product though :person_facepalming: .

That is why they went with the first Gen 70’s they take longer to COOK…

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 fan…
The bit of airflow outward gets immediately sucked back in by the inlets, apparently…

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. Don’t know why Imalent engineers can accept this kind of active cooling with minimal airflow?

The faster it spins, the more air displacement.
Maybe they forgot an air intake altogether…

hm where does all those hundreds of watts heat go then? makes no sense…. 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 there…

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 me…

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 don’t 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 it’s 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, it’s not a straight forward flow. The fan style they are using just seems odd. I’ve 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.

I’m 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 120° of the diameter. So it had 3 inlets and 3 outlets.

The new version of the X70 has the external fan and “looks” like it has air blowing across the exterior.

I am still guessing on the MS12 design. Their fan style and layout is very odd. I’m guessing they are using a divider to get the air to go in one side and out the other, but it’s not working very well.

Used in laptops a lot.
It’s a centrifugal fan. Picks up air in the centre and blows it out the outer perimeter.
It basically spins the air that’s in there and flings it outward.
Very effective.
Vacuum cleaners work that way too.

You misunderstood me. I’m familiar with all fan types, but centrifugal is not often seen inside flashlights. The FB1 uses a centrifugal, but it’s 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 somehow…

They have to call a aerodynamics expert to fix the problem. :slight_smile: