As I said... I like just sun for a day or two..... You didn't say what lights... Be careful if HID (MH/HPS).. start at about 18"+ and watch to see if OK... Good rule of thumb..if too hot for back of hand..too hot for plant..
They're still wearing their helmets (seed casing).. they'll fall off in a day or two..if not gently remove them.....