[Clansman]

fair enough, a little bit of additional light would keep the egg numbers up and help with the food costs

[Stereo]

I have found that it increases feather pecking dramatically. Everyone's set up and birds will be different but in my set up with my mix of hens, putting a light on in the house makes them kick off. They go in the house to roost and lay and that's about it. They have shelters outside and I really don't want them shut in there with a light on. I know it works fine for some people but not with my hens. Maybe they are just nasty.

[Clansman]

Maybe 

Just out of interest, what sort of intensity/wattage of light were you using when they started pecking?

[Stereo]

Just a simple 12v system off a car battery. Not sure on the wattage but it was not overly bright.