Doesnāt convection have a bigger impact on cooling than radiation? Certainly with a slight breeze it would, but even with still air it must have a pretty big effect. Anyone know the actual number?
Convection is dominant part of cooling, otherwise flashlight would become hot much faster.
Well, as a rough guess, most small lights that are thermally regulated seem to stabilize their output at about 500 lumens, if you tail-stand them. Thatās about 5 watts of power, with maybe 50% going OTF in light? If youāre saying 1 - 2 watts of that is radiative, then that leaves only 0.5 - 1.5 watts for convection.
Doesnāt sound like enough. I thought convective cooling would be 3 or 4 times what radiative cooling can do.
It is - at high power, ratio of convection/radiation dissipation depends a lot on input power/flashlight temperature. S2 head has very small surface area,1-2Watts is enough to increase temperature close to 60C over some time.
Specific thermal conductance/conductivity and specific volumetric capacitance/capacity are very different properties of material.
Copper has almost 2x times better spec. thermal conductivity (Sinkpad numbers you mentioned), but spec. volumetric capacitance is only 30% better.
Spec. volumetric capacitance determines how much temperature would rise when material receives thermal energy/heat.
Just noticed that these are all sold out now.
Mine shipped this morning, so the three week countdown to here has started. Thanks to Simon Mao and J-Dub74 for making it happen :+1:
I just ordered but wasnāt sure what options for driver or led was available, what are the available options.
You can basically ask for anything thatās available in another version of the S2. You can see the older S2 configurations here:
and the newer configurations here:
Other tweaks may also be negotiable, possibly at an extra charge.
I went with a 7135Ć8 Biscotti driver and an XPL HI U6-3A LED, along with AR glass and a smooth reflector. Basically copying one of the new Desert Tan S2+ configurations.
Iāve never turned a S2 into a tripleā¦ Whatās the easiest way to do so?
If i could get a triple Nichia 90CRI drop in that works with the A6 driver that would be great.
You have to make or buy a spacer.
Copper is best, aluminum is goodā¦
Kiriba-ru sells some, for a reasonable price IMHO
+1! Bought some from him and Iām happy with those!
I didnāt buy the S2+ copper but this surelly looks pretty!
Modders, show us what youāll do to yours :smiling_imp:
Was one of the first to order it, but had to cancel because I had not specified led and driver, et cetera.
Apparently this caused the light to re-appear in stock only moments ago. And I (re)ordered the (truly) last one. Sighā¦
EDIT: And 15 hours later it is already on itās way to me :partying_face:
Great, doesn't it? :-)
Mine is going to be a custom build with H1-A 3A boost driver and an XHP50 90+CRI G4 35G. Gotta decide if I'm gonna put a 10Āŗ or a 5Āŗ TIR on it. Up to 1600+ lumens OTF if I'm not mistaken, I could increase driving current a bit but it's going to be gifted to a non-flashaholic lady (a very smart person).
Cheers ^:)
Mines on the way and I ordered it as a host. Itās being kept to build out as a future gift. But if I take a liking to it then Iāll keep it.
This sounds interesting, please do post about it when you built it 
Barkuti, isnāt the H1-A 20mm? I thought the S2+ used a 17mm driver. I think what you are proposing would be an awesome build, so Iām just wondering how you are going to do it. I might be off on the driver dimensions or maybe thereās another H1-A Iām not aware of. I was looking at the one on KD. Thanks.
Yes, but take a look at Jensen567's S2+ builds. Since I have a powerful hot air gun I'm gonna solder the H1-A to the pill in a similar way (I also plan on slightly biting the H1-A board for the pill indentations).
Cheers ^:)
I cannot believe I missed this light!!
I certainly hope there is a batch #2 in the worksā¦
Shame I have 4 Convoyās already. Very niceā¦
Simon just told me ā¦ about 2 months for batch #2