The light energy released from a light bulb are called light photons,
these are small atom particles. The atoms release light photons when their
electrons become excited (Electrons are negatively charged Particles)
Light bulbs have a simple construction. (The first electric light
was made in 1809 by Humphry Davy, an English scientist)
Tungsten is used for the filament coil, this is a hard metal and
has an very high melting temperature. The glass is filled with an inert gas
called argon. At the bottom, there is two metal contacts, which
connect to the ends of an electrical circuit. The metal contacts are
attached to two stiff wires, which are attached to a thin metal filament.
Bound electrons in the vibrating atoms may be boosted temporarily to a
higher energy level. When they fall back to their normal levels, the
electrons release the extra energy in the form of photons.
Incandescent light bulbs give off most of their energy in the form of
heat-carrying infrared light photons -- only about 10 percent of the light
produced is in the visible spectrum. This wastes a lot of electricity...
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