Tuesday, June 26, 2012

Does a light bulb that produces more light also produce more heat?

Yes. When comparing light bulbs of the same type, a bulb
that produces more light (or is brighter), produces more heat also. This is largely due
to the fact that bulbs are not capable of converting all the input electric energy into
visible light. As the efficiency with which light bulbs can produce visible light is
less than 100%, with an increase in the production of visible light the production of
infrared radiation or heat also goes up.


In most types of
light bulbs, the ratio of energy dissipated as visible light to the energy dissipated as
heat increases as the wattage increases. The same amount of light produced by two
smaller bulbs will lead to the production of a larger amount of heat than if the visible
light were produced by a single large bulb.

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