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Wow, so random battery switching with the same incredible run time, wowOk. Repeated experiment. Made sure all the lights are on the brightest setting. All batteries charged equally and scrambled. S12 appears to be the brightest from the start, but dies by 2 hr mark. D550 went somewhere between 2.5 and 3 hrs. D530 while visibly dimmer at the end went 17+ hrs runtime. Pretty amazing.
The right way to take pictures like this to suggest relative illumination is to set the camera's ISO, shutter speed, and f/stop the same for all pictures, and not put the camera on automatic.I called my experiment at the 3 hour mark because, while both lights were still putting out light, it wasn't anything close to what I'd call "useful" light. My last pic above makes them both look brighter than they really were. So, maybe the 530 will stay illuminated for as long as Ukmc is seeing, but is it putting out useful light at that point?
That is absolutely correct, except you would have to control for ambient light as well. In this case, as the light intensity was decreasing, ambient light was decreasing as it was getting later at night, and the light itself seemed to be as bright. As such it brings up an interesting point, about how you would want your light to behave as the battery charge decreasing. would you want the light to cut iout all of a sudden or decrease in intensity and keep on going?The right way to take pictures like this to suggest relative illumination is to set the camera's ISO, shutter speed, and f/stop the same for all pictures, and not put the camera on automatic.