Depending on where you are, you may not need to use extra light at all. I'm in KY, don't use extra light, and have eggs all winter long. Actually, more than in the summer, because I keep broody breeds, and in the winter they don't brood.
You only need extra light for peak egg production. Except for a few breeds that only lay seasonally, (like Barnevelders) the idea that hens must have 12-14 hours of daylight to lay eggs is simply not true. It is a myth. If you have breeds that will lay in winter, unless you are far north and have no daylight, or less than 8 hours, I wouldn't use extra light at all, unless they need it for heat. I do that sometimes if it's going to be 20F or colder, maybe a total of 1 or 2 weeks (spread out), where I am.