I have one white leghorn and two Rhode Island Red hens, they were laying 3 eggs a day for about two month, then they stopped none in about a week . I've got a 100 watt bulb on them on a timer from about 5:30 till 7:00 am each morning , still nothing. Been feeding them layer pellets for about 8 weeks. They are about 8 months old, need some help, THANKS..