Post by matt on Apr 27, 2020 12:59:12 GMT
Here's an interesting one for you - a study looking specifically at the amount of light within nest boxes for great tits (it is incredible what is out there when you really start searching!).
The upshot of this study is that great tits prefer lighter boxes over darker ones, which is very interesting (and good for us camera users). They tested this by adding translucent windows to each box, and obscuring them to various extents, but we can replicate with our own lights. So this does suggest that lights won't do any harm, although perhaps it is possible to go too bright.