Hello! I have been using a 250 watt heat lamp for my week old chicks. I want to switch to a Titan Incubators 12" X 12" Brooder Hen/Electric Mama Hen Low 20w Chick Heat Plate. Will they be stressed in the dark without a light? I know in nature they wouldn't have that light, but want to double check. I am also wondering if the heat plate will provide enough warmth beyond the plate itself. I currently have them in my basement which is around 60 degrees F. Thank you.