Thanks for the help!

Using LightPollution maps I found my sky brightness for my home (21.54) and my portable observing site an hour away (21.98). I live at 7,000'.
It would seem that humidity makes a difference to. At my home, humidity ranges from 0 to 60% with an average of 25%.
I can visually notice the sky brightness difference when the humidity is in the single digits - vs when it is over 50%.
I guess having an SQM meter may be best vs using a static measurement from the maps.

Regarding the filter bandwidth.. I understand the narrowband filters easy enough - but for LRGB do I use the total width? For example, the LUM is 420 – 685 nm. Does that mean I use 265nm?

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