1. This from the Nutrena site.Hey I was just wondering what everyones take was on lights in the coop at night. Do you think leaving a light on at night would effect laying?
Research shows that chickens lay best when they receive about 15 hours of light daily. In the northern United States, natural daylight drops to under nine hours at the end of December. To optimize egg production, supplemental (or artificial) lighting in the coop is a must for the next three to four months until the days get longer.
As for hastening laying, I can't say, but I prefer to let the get there naturally. Some breeds take longer than others.
I suggest situating your coop windows East and West for the maximum lighting.
2. As for SIZE, My first batch of chicks, (8 different breeds) I had a Dominique hen who was smaller than her sisters. She still laid and was fine. Then I had sometime later White Orps. One hen in that group was smaller too. Point sometimes you get a smaller bird. If they lay and you're okay with it, it's not a problem.