Please know that I have the utmost respect for @nuthatched and her opinions and I usually agree with her. However, my birds have been known to take a 6-month "break" from laying, which I find excessive and unacceptable. So when all of them are done molting in the fall, I figure that's a long enough break, usually several weeks (up to 6 weeks), and then I add a little light to the coop to reset the production process. It doesn't take bright light, a night light will do. If you can read a newspaper by it, that's sufficient. Commercial producers give their birds 14 hours of light a day; I feel that's excessive. I give mine enough light to equal 12 hours. Many people say the extra light should be given in the morning. But I am not and never will be an early riser unless my house is on fire and even that is debatable. So my birds get a night light in the evening. I have found that it takes about three weeks to get production started and about another week to get it really going again.
I just use a regular household bulb. Today's LED bulbs don't get hot so I'm not worried about the potential for fire. At 7 pm my DH goes out to "de-light" the chickens, lol.