Longer rubtimes on turbo and higher output when stepped down? I’m wondering if adding 18650 tube and battery will provide any significant changes as thermal mass will be increased.
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How hot is the current battery tube getting compared to the light head on Turbo currently. The longer tube would add some mass for heat absorption and dissipation, particularly if heavier and thicker walled, but the thermal path between the head and tube is the question. I note for instance that the Acebeam X75 has made a serious design effort to isolate the light head from the battery as much as practical so I doubt that the extended battery they offer will offer anything more than extended run times overall.
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I’d say yes technically it will be a better heat sync, but by any amount you’d notice, probably not.
Now I’m curious though. I have one, and both tubes. Tomorrow I’ll see what I can get for a reading with infrared gun(they dont like shiny surfaces), and see if differences are apparent.
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Awesome, thanks!
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So, as scientific as I could, fresh 18650, long tube, 1.5 mintues on turbo.
A plastic tail cap on the light, that I held, so as to not influence it by my hand being a heat sink on the main tube.
IR thermometer shooting the side of the light 90 degrees off from the switch, 1 minute 30 second, to 40 seconds, it was 100 to 105 degrees, Farenheight.
Let light cool till it was cold to the touch(only 60 in the room anyway).
Swapped for short tube, same tail cap, and a fresh 18350.
Same test, full turbo.
At the minute and a half to minute 40sec mark the light was only 90 to 95 degrees, same spot as before.
It took till the 2 minute mark to hit 100/105 degrees!
Even at 2.5 minutes it was only about 115deg, seems like it wasn’t climbing near as fast on the smaller cell. (but I didn’t run the 18650 that long either-- it might have leveled out and slowed down at 2.5 minutes.)
I was hitting the temp gun repeatedly, getting several readings for each setup, lets say over 10 seconds, probably 5 reading, all within 2 or 3 degrees, climbing in general, all within a 1/2" area on the light; These heat guns don’t like a shiny surface; Wanted to be sure it had a kinda average.
So…yeah. As counter intuitive as it is, the short setup was cooler running, for slightly longer.
Honestly only did it the one set… Guess for scientific general concepts I should do the same run a few times. I can do it a couple more to see if it was a fluke if you wanted? Or if it averages out to no real difference… Might just do it for my own curriosity.
Only thing I can think of is the bigger cell provided more current and it heated faster, but I’m not sure thats possible… The light should draw the same regaurdless of the cell used?
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My money is on that. Do you have a lux meter? You could compare throw between the two cells as a proxy for output. If you have a clamp meter you could compare the current at the tailcap. I could do those tests sometime in the coming days.
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Thanks for taking time for doing this test. I also think the light was drawing more current from the 18650 battery and heating more with higher output on turbo. I find no other logical explanation. If you have a meaning pf measuring output during the tests it would be awesome. But again, appreciate your time doing it.
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This would be my guess. I have a lumen tube to measure output and the the battery makes a huge difference.
Checking at ceiling level of simple mode:
Vapcell H10: ~800 lm
No name battery: ~500 lm
Big drop about 30%.
The light doesn’t draw the same from different batteries; at high brightness level, it could draw only as much as the battery could provide.