True or not true? It takes as much energy (read: electricity) to turn
on an electric light as it does to run one for 20 minutes?
Not true. At least not for incandescent lights. I have heard that may
be true for fluorescences though. For incandescence (the ordinary
household bulbs) the turn-on energy amounts to at most a few seconds
of ordinary running time. It does involve an increased current
through the bulb that may shorten its lifetime though - you may
have noticed bulbs tend to go out almost immediately after being