In these two cases, the differences with the specified may be related to the thermal control system. When the flashlight reached 70ºC (external), I turned on the ventilation, the temperature down, and the power up.
This is reflected very well in the graphs, but I do not want to put some data that will vary appreciably after the head modification.
The real problems of runtime come in other modes, as they are much more powerful than specified, so the runtime is greatly reduced.
Always turn on ventilation around the outside 70 degrees. We can check the difference in time to reach that temperature and how the light flux is modified
When will they send you back the head of the light?I see restocking is in September 30 at BG’s site plus they allow pre-orders.
If there was the full review,and was positive,it could be possible to buy one with a coupon.But I don’t know if the coupons are valid till the full review is uploaded. :person_facepalming:
Nice man, looked at your other reviews too and dang I understand why they send you top notch lights, what nice pics and depth in review!
Looking forward to your results in how much those holes make a difference, we can talk aboit it (I really think it hardly makes a difference) but a real test goes way beyond that.
Two computer fans, powered by a power supply. I can apply the air directly over the flashlight, cooling it quickly, or I can turn the fans and draw warm air around the flashlight. This second is slower, but may come in handy to analyze electronic temperature control systems.
I think it’s just a way for them to increase the surface area of the light, just like with external fins. Except that they can have maybe double the surface area without making the exterior fins too bulky and large in diameter. It’s just improved packaging.
The most current pics show a heatsink similar to this, but with a bigger diameter center and shorter fins.
You can see it here.
The plate style may have been too costly to implement, but it would allow air to enter one side, go all the way through and exit the other side. This particular design needs air to go in and back out the same vent holes. Not as good.
yeah and it looks cool, but without a way for air to actually pass it IMHO and in my estimation, no real benefit, so nice it can be tested when the new head arrives!
I’ve been thinking about this since our last discussion about this. This reminds of when it’s a super hot summer day, and you’re walking with a half unbuttoned shirt in the blistering hot sun. There is a huge difference whether there is absolutely no breeze whatsoever, or whether there is a light breeze. With a light breeze, it is so much more comfortable.
This is how I see Imalent’s passive cooling design; you need just a light external breeze for the design to do its work. And this should be the case when you’re walking outside.
Well there are different ways to transfer heat. Your mostly thinking convection with moving air across the hot object. That is an effective means of heat transfer, but there is also radiation heat transfer.
Think of a radiant heater. It has no air moving across it, but it still can warm up a room.
Just having a larger surface area for the heat to spread out allows for more heat transfer using radiant energy. It’s not as good as convection, but it does work and becomes more effective as the temperature difference between the fins and the ambient air increases.
So I’m sure your gonna get better cooling with the air holes open than closed, but maybe not a huge difference. But if you introduce some air movement, like using it on a windy day, then you get a bigger improvement between closed and open holes.
I like it, it’s like a middle step between a regular flashlight and an olight x9 with the fan cooling.
I’m thinking they could have added more holes, though.
You might be thinking of evaporation. When its hot your body perspires and a light breeze can cause the liquid to evaporate which has a big cooling effect.
Fins add lots of surface area for convection but none for radiation.
The radiation surface, as far as surrounding space is concerned would be represented by a “shadowy” image of the form of the light.
I think :partying_face:
After thinking about this some more, this is only true in a vacuum
The real world is more complicated.
