It sounds like your setup is a bit small for the number of birds you have . This will also lead to stress and reduced egg production.Thank you @DobieLover and @JedJackson . I have about 20-25 hens and either one or two roo's (I know one but we are still debating on if another is a roos or hen, can't tell by its rear feathers and it doesn't have tail feathers). They have a fenced in run, about 10-15 ft long and that wide also. Their coop has several layers. the lower layer fluffed up with lots of hay, the egg boxes above that; above that a flat surface for them to rest on and several boards criss crossed for them to roost on as well. That is the room/part that the light is in. There is a door on the coop with a chicken door on the bottom for them to go in and out from the coop to the run. I had just started with the light about a week or less ago and the chickens are less than a year old. We got them last spring from tractor supply. Like I mentioned in my other two replies so far, I will be getting them the correct nutritional feed that they need tomorrow and get them back on the healthy road. Maybe some worm treats would be good? Not sure but was just thinking out loud...
Can you post pictures?