I have 18 week old buffs and have heard sooooo many different veiws on the subject. I am using a light for 17 hours a day. Is it too early for them? Is it too much light? When do pullets turn into hens? I've also heard that I am supposed to feed laying food at least 4 weeks before they start to lay. I bought a commercial feed ( layena ) and added oyster shell to it. I am soooo afraid of harming my sweet babies. This is my first time raising chickens.