Thank you for your help. Would the lack of an IR filter create misleading results since light pollution is not IR? I would expect that this would contribute to noise, but I could be mistaken.

Thanks for the advice. My problem with the lux meter is that I would like to map out where the light pollution is like in the photo on this page on sky and telescope .Do you know what other camera specs will be important? For example, I am not sure what kind of exposures, gain, megapixels, etc. I would need for this project. Thanks again.

Why would it need a tracking device if it is looking at the whole sky? Even if stars streak, shouldn't the average brightness levels stay about constant? If not, what do I track, where zenith was?