Hmmmm...
Light is a force that could be used by some malevolent animal bent on ruining the farmer's life...
(
The Hedgehog From Hell is putting a donk on it, Sat 15 Sep 2007, 0:38,
archived)
Too much light could keep the chickens awake
I doubt they'd lay any eggs if they were suffering from exhaustion.
(
SugarSpunSister will characterise for cash, see profile, Sat 15 Sep 2007, 0:41,
archived)