35 HID Dive Light...

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Salvo 35W lights and 35W auto HIDs both put out around 3000 lumens, so 3200, while a tad high, is not completely unbelievable. Or maybe its the color temp!

KOMPRESSOR:
As stated, I'm not as sharp in math as I used to be. But if you compare your light with state of the art AGIR Lugh9, a 21 watt HID with a 9Ah 12 volt battery, it gives 210 minutes of light time. So I'm confused. And they say your light gives off 3200 lumen(!), which is another spectacular number I haven't seen spec'd on any other dive light.
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oxyhacker:
Salvo 35W lights and 35W auto HIDs both put out around 3000 lumens, so 3200, while a tad high, is not completely unbelievable. Or maybe its the color temp!
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And how much of those 3000-3200 is actually within the range of the human eye? ;)
If Agir's 21w pumps out 1500 lumen, one would think you'd theoretically need 42w to push 3000, right? It's all at 6500 kelvin, so that's not a factor. I don't know. And I still haven't figured out that about the battery pack either. If it smells like a fish...
 
oxyhacker:
I suspect that's just a misprint. 3.7V at 2200 mah works out to just 3 AA batteries in parallel, which is not going to run a 35 watt HID for 3 hours.
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What, you mean an 8.14 watt-hour battery can't run a 35-watt light for three hours (105 watt-hours)? :D

3.7 volts is the voltage of single lithium-ion cell. You would need a total of thirteen 2200 mAh lithium ion cells to get 105 watt-hours, and they apparently fit them in a cylinder less than 3.5 inches in diameter and something like 6 inches long. They're not AA form factor, obviously, but I don't know how simple the volumetric energy density of Li-Ion cells makes this.

Okay, assuming six inches by three inches in diameter, that would make the volumetric energy density approximately 150 Wh/l (watt-hours per liter). As far as I've read, that should be well within reasonable numbers for lithium-ion cells these days, at least assuming no spatial inefficiencies. It may have to be a custom battery, but it's not implausible.
 
I think the battery specs are for a individual battery from the pack,3.7 volts,it would take 4 just to get to the right voltage.
 
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