I could be wrong, but I think they’ve been gradually replacing sodium and/or mercury vapour street lighting with some other fluorescent variant over the last few years (not LED as far as I know). No doubt to save money, not light pollution.
Speaking of LED, I’ve just replaced a number of old ceiling mounted halogen interior down lights with LED versions due to some safety concerns with the old technology in my house. As my backyard observatory is very near our living room I’ve wondered if I’m seeing the effects of this appear in my background (must dig out some old files to check).
Ernst – I’ll happily email you that FITs file.
Paul