Acebeam X70 - 40000 lm - 8*18650 - Active fan cooling

Oh they can produce it, but they may not want to go into production with it. There’s lots of possible reasons for this.

C02 cannisters?

Maybe they can bundle one of those misting fans with each light. Put some ice in the bottle and every time it gets too hot you just spray it a couple times.

Edit: That was a joke, in case anyone thinks that was serious.

But i dont get it, acebeam showed earlier the prototype with 3 fans, same did olight so its weird if also they now ditched the fan design, the light will cost alot more then x9r so for that much lumens i think active cooling is a must if they want longer runtimes on max then a few min …

I do believe that those three little fans are about as good as useless against this kind of heat.

My thoughts. I think they overestimated the amount of heat the fans can dissipate.

makes sense when u think about it, such fans even if 3 in that head can they really push out that much heat fast enough? probably not… but who knows.

Not at all. Based on my calculations, it just might be able to do 40k lumens continuously. It’s kind of at the limit.

Now 30k continous is definitely doable.

So if 40k lumen is borderline, I could definitely see it doing 40k for at least 5 to 10 minutes, then step down to 30k for the rest of the batteries life.

Even this is a huge step up from the 7k continous lights we currently have.

But once the batteries drop half their capacity, the volt isnt too low too keep up that much lumens? im skeptical… my olight x9r i cant do 2 highest modes once battery shows 4 bars out of 8 left… ?

I’m sure the output has to step/ramp down once the batteries start to drop voltage. This is normal.

Care to share your calculations?

Considering the XHP70.2 thermal resistance of 0.9C°/W and a max Tj operating temperature of 150°C, with 29W input, and 23°C ambient, this would mean the heatsink could be allowed to rise 100°C above ambient, yes? Though the LED output would be reduced to 85% of the rated maximum at this Tj. To maintain 85°C Tj, the heatsink would only be allowed to rise 36°C? This is probably overly simplistic. Will dig into the requisite math more later.

DX80 only does 7000 lumens continuous? Or are you talking about a different light?

With the very basic understanding I have of this matter, you are not wrong.
I think that with 3 fans it would be possible to keep the heatsink at a decent temperature, let’s say 100°C. Even if the fans can’t handle it the time it runs on full power is extended. So it’s a win nevertheless.

The lack of surface area to dissipate heat will make the fans less useful, and the few fins on the X70 are pretty thick based on the picture. If they used a CPU style heatsink it would be a whole different story.

I used this heatsink with a CXB3570 @ 85W and it was just warm to the touch. The fan was running at slow speed drawing less than 2W. I can see the potential here and possibly keep the temp at less than 65C at full speed even if we triple the load. https://www.amazon.com/gp/product/B00606OHQQ/ref=oh_aui_detailpage_o02_s00?ie=UTF8&psc=1

The problem with acebeam is they insist on using small fans with tiny propellers with relatively low CFM, even 3 of them can’t compare to a properly sized fan.

I think this would be a more effective solution: fresh air is drawn from the back and exits through the emitter side (sorry for the quick paint job) :smiley:

Looking back at my older posts in this thread, I think Acebeam was shooting for 30 minutes at 40k lumen. Then it would have to reduce output. Does anyone remember Acebeam saying this?

See this post in my active cooled lights thread.

Yes, DX80 seems to hold the record followed closely by the Acebeam X65 which does about 6k continously with air circulation, 5300 in still air.

Maiden666 tested it. It will do about 6k lumen in a room with no air circulation. About 7k if a fan is turned on (which I think is equivalent to walking around with it outside). I talk about it here.

We have not seen their heatsink or fins. Where did you see them? I think they may be using something very similar to cpu heatsinks.

The X70 fans (3 x 30mm or 40mm) are mounted vertically. There is room for a ton of surface area to dissipate heat.

Actually the x9r can do 6400 nonstop until battery runs out so it beats both the dx80 and x65.

Mortuus, you should know better. We don’t go by rated specs. We go by real world tests.

Let’s wait until it has been tested to see if it can do 6400 lumen continously.

BTW, this is still less than the 7000 lumen continous of the DX80.