We used a string of white LED Christmas lights in our layer pen. We did let them finish their molt before doing so. We hung them high in the coop and eggs came just fine.
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You only need a little light. It is often posted just enough light to read a newspaper. I use a 13 watt CFL.
Often in their first year pullets/hens will lay well without the extra light, of course there are variables.
Imp- and yes my chickens like to read the newspaper.
We used a string of white LED Christmas lights in our layer pen. We did let them finish their molt before doing so. We hung them high in the coop and eggs came just fine.
Heating in winter is a bit controversial.
I'm not as cold as you are, but I do have heat available if I want to use it. I use a small electric heater.
Imp