Thanks for the donation here as well. if we can come up with a good design for a Q8 lantern I could get it 3D printed for testing.
For the Q16, the biggest issue here will be heat shedding. It will need a massive heat sink.
With 4x xhp50.2 or 70.2âs it should easily surpass 15k lumens, with xhp70.2âs it could get close to 20k or more.
The problem is that it would also be pushing upwards of 200-300W worth of power, which is going to get REALLY hot. So figure it will need to be quite large indeed to reach that level.
Honestly Djozzâs spotlight idea that was tossed around for the GT at first would be ideal for this, it would allow for an active heatsink (aka a fan) and could actually handle that king of power.
Although it would most certainty not be considered âcheapâ by BLF standards even if it was the best bang for the buck around.
Honestly, if something, whatever it ends up being; is the âbest bang for the buckââŚ. âBLF standardsâ may have to possibly change a bit.
Many times quality and dirt cheap do not go hand in hand.
Sure, bargain for the absolute best price that can be achieved and then that is what it is. :+1:
IMHO anyway⌠& I am far from being a monetarily rich man in saying that.
Liquid cooling is way overrated. You still have to transfer the heat to the ambient air and liquid doesnât help that much. You still need a lot of surface area to do that.
Yeah. While liquid cooling is better than active air cooling it is not worth it because you still need fans with liquid cooling.
I have a different idea.
Did you put pressure on tip of these pressured gas cans before? If you did, you probably know that they make extreme coolness. I do not know if this is practically implementable but think about it.
There are refillable CO2 cartridges for air guns. They are available in everywhere, especially in USA! Even though they can be refillable, they are also very cheap.
I do not know cooling performance of these CO2 cartridges in terms of Joule-Thomson effect. These cartridges most likely do not provide enough temperature decrease for these kind of lights. But this is just an idea and we need to fix this heat issue somehow or there wonât be q16.
While a Co2 cooled light would work it would take a LOT more then 12 gram cartridges (of which I happen to have 175 of them for sale if anyone is interested).
A 12oz Co2 tank should keep it cool for awhile though. A more practical option is to use the heat shedding abilities of evaporation to cool it. I ran some tests and it takes a surprisingly small amount of water to keep a lot of heat cool. As it evaporates it removes a LOT of heat. Although you would then have steam pouring out of the light and have to fill it with batteries and water but it would keep it reasonably cool.
Btw off topic but why would a Texas man own an airgun? Come on man you are not Canadian :laughing: I thought you are all about real guns, which is a good thing imo as air guns are JUST waste of time.
An airgun is a lot cheaper to plink with now days sadly. Even .22 is not what it used to be. Although these particular cartridges actually came from my paintball days. I had a few pistons and other guns that used 12 grams and ended up buying them in bulk to save money.
My 5.56mm AR-15 with silencer is a lot more fun and more practical but sadly for the cost of a single round of ammo for it I can fire off a hundred BBâs or several .22 rounds.
have a small tube running through the heatsink that you can spray an upside down can of computer duster through (r152aâŚ. 1,1, difluoroethane) to allow for a crazy direct drive turbo hehe.
Good to see the fund broadened to driver development :+1:
One-button UIs like Biscotti are very handy for blind people like me. I wouldnât have access to anything like the range of options I do, if it werenât for the driver developers here on BLF.
There was a discussion on various battery pack configurations and how some are more efficient than others.
I got interested and wanted to quantify what is more and what is less efficient.
I modelled battery pack volume vs capacity.
Assumptions:
thereâs 0.5 mm between battery and flashlight body
battery tube is 0.75 mm thick
if there are several batteries, thereâs 0.5 mm gap between them
with xx650 batteries, battery tube doesnât fit xx700, just xx650. DQG Tiny is an example of a design that gets shorter with shorter battery.
2~~, 6~~, 8~~, 14~~ cell packs are 2-cell long
all battery tubes are round. Rounded-triangle or rounded-square would be more efficient in 3/4/6/8 cell configurations, but thatâs not what I calculated.
Results:
Legend:
N V -> volume with N batteries
N E -> capacity with N batteries
N ee -> efficiency (mAh/mm^3) with N batteries
I wonder why 3x18650 isnât used more. Itâs quite good.
My spreadsheet skills are too low to visualize this. The way I set it up even hints in the spreadsheet are useless.
What I do to locate a certain point is 1) identify the data series by looking at clear outliers with the same symbol (which is a column) here. 2) look up the size in the column.
I do not suggest others do this, but rather Iâm looking for suggestions. I can upload the raw spreadsheet if anyone is interested.
I should have noted: Pareto-optimal (size vs capacity) packs are bolded. There are quite a fewâŚ
Iâm not sure what do you mean.
Though I should have noted one more modelling assumption: battery tubes are round, regardless if they contain 1, 3, 4 or 7 cells in crossection.
