My ecologist started talking about this when I had the bat mitigation designed for the Bat Licence. The next ecologist who visited from the same company didn’t mention it, so I didn’t bring it up, so I’m not surprised it’s become another ‘thing’ to worry about.
We’ve got street lights nearby, so I don’t think my odd outside house lights make much difference, but I’ve made sure that they aren’t like Blackpool illuminations, because I do care about wildlife.
From what others have said, atm it looks like you can draw up something sensible yourselves. Maybe get some biology students to help.
You could spend a lot of money getting an ecologist to survey and design a mitigation plan if you want.