Light dispels
darkness, and fills the environs with effulgence that enables people carry on
their duties uninterrupted. A few activities are earmarked for nights, due to
congenial conditions. And do meet the demands of certain commodities which
cannot reach the target figure, even if the whole day
is utilized for production, night work is found indispensable. Hence the night
shifts in production centers of industries are introduced to carrying on the
large scale production aiming at global market. This is so far the external
benefits or visible results of light is concerned in a wide variety of its
manifestations. starting with the earthen lamp the mother of light as it were
followed by candle light, gas light. electrical light, electronic light so on and
so forth. This applies to material world. Its utilities are well known.
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