My Easter Eggers had stopped laying completely in late September and didn't start again until I added supplementary light last month. It took about six weeks of the "light therapy" but I'm getting about 5 blue eggs per day from 8 hens.
I have a light on a time and add about 4-5 hours of extra light per day.
I have a light on a time and add about 4-5 hours of extra light per day.