I am not a fan of adding artificial light and I will give you a few reasons why.
1) I keep hens because I respect the "back to nature" aspect of it - so, I don't want to meddle with nature.
2) There is talk that hens *need* 14hrs of daylight to be able to lay; this is poppycock! I'm experiencing 10hrs max daylight now and they are laying.
3) Very recently, I had a fox attack one of my girls. As a consequence, for recuperation purposes, she was housed in a pet carrier in my home; this also meant she was on human time = artificial lights between my waking and sleeping. Did it make her lay? Well, it could be argued that, as she was injured, she wasn't going to lay anyway! But, by that same token, once she was returned to her flock, she was back to nesting. In human time, the lights either went "On!" or they went "Off!", no dimming involved.
Light dimming would involve some kind of dimmer switch; I don't see how this would impact on your neighbours one way or another - only your utility bills