Hi, I have 3 Light Sussex chicken. They are about 5 months old and did not lay their first egg yet. But we live in Canada with cold weather, and the coop is cold we have a heating light and everything but we didn't put it on yet because it's not that cold yet, but should we put it on? If we want our chicken to lay eggs do we open the light, does it change anything. Or we just put the light on when it is really cold? Thank you Worryrat.