Just a little update from me.........
We brought over some of those garden solar spotlights from the Uk,you know the 4 for a tenner ones. Boys being boys,I took one apart to see how it worked and ended up with more pieces spread over a large table. Anyway,I extended the wire between solar panel and light,put in a switch,placed the panel on the south facing wall and the light inside and hey presto! It's only bright enough to see that they are all in of a night time,I doubt it will extend their laying capacity during winter months (their coop is too large to light this way),but a very cheap alternative........Ree