I’m still looking for a runtime on high estimate - would this calculation give a good approximation? 3000mah = 3ah, 3ah/4.5a = 0.66hr, so 40min on high.
It’ll be more complicated than that because at some point the voltage will drop below the threshold required to maintain the 4.5A current draw. At that point, brightness will start decreasing, but so will current draw.
End result is the total runtime will be longer than 40 minutes, but the runtime at max brightness will be less.
No, that’s something Lumintop would have to tell us. They could design the driver to fall out of regulation at different voltages. They might not tell us, but we could still measure it once we get the lights.
Like Delta_V said, it’s more complicated than that. Keep in mind that in the real world thermal protection may activate. So you would measure on high, then turn off and cool down the light, then run on high again, then add up all the run times to find out the total run time on high (within regulation). Is that what you meant? Or did you mean how long it will it run before stepping down due to heat?
I can only say that you will definitely get longer, steadier run times at 3.5A. Also, a high drain battery will stay in regulation longer in comparison to a high capacity battery.
We won’t get any real runtime data until the light gets tested.