Cornsnakes like light...they are considered a diurnal species although crespuscular is more their style. My snakes are out at all hours of the day or night. I find snakes in the wild in the daytime as long as it's not too warm out. It's not the light that bothers them, it's the heat. There is a FAQ section on this forum that will answer all of the basic questions about the care of a cornsnake.