A typical light bulb wastes 90 percent of electricity. According
to the EPD, the typical incandescent light bulb turns only about 10
percent of its electricity into light. A typical light bulb, when
on, is hot. That's because 90 percent of the energy is wasted as
heat, which means it isn't very energy-efficient. A typical light
bulb wastes 90 percent of electricity. According to the EPD, the
typical incandescent light bulb turns only about 10 percent of its
electricity into light. A typical light bulb, when on, is hot.
That's because 90 percent of the energy is wasted as heat, which
means it isn't very energy-efficient.