Quote: Domestic dog is the greatest predator, for sheep too. At my house my dogs have killed more chickens than the coyote. My fencing is designed to keep people and chickens out of their zone. In their zone, they are on duty. In the house they just sniff a chick and walk on by. My cats too, in side the house is neutral territory!! Mice are safe too. LOL
Personally, I would go ahead and do a lower wattage bulb for each pen. It doesn't take anymore effort. That is just the way I am. You have nice pens. That would "finish" them.
FOr what it's worth, I have one bulb in a 8x6 ccop and the girls can hide from the light by sleeping away from the bulb. I'm still experimenting to see if changing the location and the number of bulbs ( relative to the perches) will increase the laying rate. I"m using a 60 watt bulb but only getting about 12 eggs a day from 30 hens . . . . this isn't conclusive but I"m thinking location, location, location.