I thought that, but it could also be that his lights are full of dark and can't hold any more.
A new theory is that light bulbs don't emit light, but actually suck dark. Once they are full of dark,
they can suck no more and break. Batteries are one method of storing the dark that has been
sucked (batteries fail once they are full of dark). Mains powered dark suckers change the dark
into smoke, and this is sent back to the power station via wires where it is released through the
chimneys.