Originally Posted by Farnboro John
I hadn't really thought about it but our council is one of those that turns the lights off midnight to 0400 (and they've been turned down somewhat even prior to midnight) - presumably this is actually helping my catches? Perhaps the OP needs to complain that their council isn't doing their bit for sustainability by not turning the lights off?
If there's the opportunity it's great to do that (complain /lobby). Councils spend very large portions of their budgets on street lighting and in many places the cash is completely wasted. Unless things have changed since when I last researched the issue, the evidence around security provided by street lights is weak, and you should be able to retain that through movement /heat sensors so the lights switch on when people pass by.
Although there's no good evidence (just because no-one's bothered to research it), I'm convinced street lighting has caused widespread declines in moths especially. It's actually a bit of a scandal how little research there has been on the negative impacts of streetlights. I think there's quite compelling anecdotal evidence of the bad effects on human sleep for example. (Good enough to warrant proper research. )
The early leds at least had large uv and blue components. But that was before they got good enough for widespread street deployment. I don't know if it's still true but it probably is (the least harmful were probably the old sodium lights). In principle, it should be possible to design and deploy less harmful leds.