The "experts" recommend early morning have the light come on.... have them head to the roost in natural sunset...
YES
Our coop lights here come on ABOUT 5:30-6 AM......and goes off about 4 PM, allowing the chickens to get into bed before the sun goes down.
If I were in E.WA where the temp was extreme, I'd not attach more light to the birds, in other words, leave them to their own devices, as Heather said " They are basically fighting for their lives now" in deepest darkest winter, and not a good idea to force these birds to ovulate, when they are barely keeping themselves warm.
Here, on the Pacific Shore, it is far warmer, and so no big deal for our birds to lay off & on over the winter.'
Over there,,,,,,,,,,,,,, yes it can be critical.