Alan B wrote:Figure out the watts (volts times amps) and multiply by 90% converter efficiency and then by 70 lumens per watt. That's led lumens, about 70% will make it out the front. So volts times amps times 0.9 times 70 times 0.7 should give a good estimate.
Thanks Alan. As the battery is 8.4 volt 4.4 amp hour and it has a run-time of two hours that should be a draw of 2.25 amps.
Therefore, only 833 lumens out of 1400. Not too bad.
Edit: That also means that the 1600 lumen Magicshine only outputs 870 lumens - assuming the batteries sold with it are 9 amp hours and it lasts four hours on full. Hmmm...