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. That’s about 5 watts of power, with maybe 50% going OTF in light? If you’re saying 1 - 2 watts of that is radiative, then that leaves only 0.5 - 1.5 watts for convection.
Doesn’t 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.
Other tweaks may also be negotiable, possibly at an extra charge.
I went with a 7135×8 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.
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. Sigh…
EDIT: And 15 hours later it is already on it’s way to me :partying_face:
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 10º or a 5º 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).
Barkuti, isn’t the H1-A 20mm? I thought the S2+ used a 17mm driver. I think what you are proposing would be an awesome build, so I’m just wondering how you are going to do it. I might be off on the driver dimensions or maybe there’s another H1-A I’m 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).