Having been in the business of selling cameras for a dozen years I had to add my thoughts... Flir is great for some things but very low lux cameras are really great also. Skyglow, the average light on a moonless night at sea, is about 100 microlux (.0001 ). I can get cameras that are .00001 lux, or about 1/10 skyglow sensitivity. At that point, the slightest white light provides color images
. Most harbors then look like it is afternoon. That AND flir combined gives more data that you thought you would ever want.
And remember, 700 line analog cameras are really cheap
now. Today I had a vendor trying to sell me waterproof (IP66) bullet cam for $20, postage paid. The same cam was going for over $100 a year ago. High resolution (1080p, 3MP or more) camera pricing has dropped, too but their light sensitivity hasn't quite matched the cmos cams. Y'all get ready to buy, I'll try to help find a deal for you.