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Mechanical

Sources of Light

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Gas-discharge lamps

WHIH !E"E#$%ES LI!H% &' SE"(I"! $" ELE%#I$L(ISH$#!E %H#*+!H $" I*"IE( !$S, $ -L$SM$.

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Low pressure dischargelamps

L*W-#ESS+#E L$M-S H$/E W*#0I"! -#ESS+#E M+H LESS %H$" $%M*S-HE#I -#ESS+#E

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1luorescent lamp

 is a low pressure mercuryvapor gasdischarge lamp that uses2uorescence to produce visi3le light.

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High pressure dischargelamps

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 metal-halide lamp

is an electric lamp thatproduces light 3y anelectric arc through agaseous mi4ture ofvapori5ed mercury andmetal halides

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High-intensity dischargelamps

$ HI!HI"%E"SI%' (ISH$#!E 6HI(7 L$M- IS $ %'-E *1 ELE%#I$L L$M- WHIH -#*(+ESLI!H% &' ME$"S *1 $" ELE%#I $# &E%WEE" %+"!S%E" ELE%#*(ES H*+SE( I"SI(E $

 %#$"SL+E"% *# %#$"S-$#E"% 1+SE( 8+$#% *# 1+SE( $L+MI"$ $# %+&E.

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Mercuryvapor lamp

is a gas discharge lamp thatuses an electric arc throughvapori5ed mercury toproduce light. %he arcdischarge is generallycon9ned to a smallfused :uart5 arc tu3e

 mounted within a larger3orosilicate glass 3ul3.

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electrodeless lamp

 %he internal electrodelesslamp or induction light is a gasdischarge lamp in which the powerre:uired to generate light is transferredfrom outside the lamp envelope to thegas inside via an electric or magnetic9eld, in contrast with a typical gas

discharge lamp that usesinternal electrodes connected to thepower supply 3y conductors that passthrough the lamp envelope.

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Excimer lamp

 6or e4cilamp7 is a source of ultraviolet light produced 3yspontaneous emission of e4cimer 6e4ciple47 molecules.

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Incandescence

IS %HE EMISSI*" *1 ELE%#*M$!"E%I #$(I$%I*" 6I"L+(I"! /ISI&LE LI!H%71#*M $ H*% &*(' $S $ #ES+L% *1 I%S %EM-E#$%+#E. %HE %E#M (E#I/ES 1#*M

 %HE L$%I" /E#& INCANDESCERE, %* !L*W WHI%E.

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om3ustion

3urning

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!as Lighting

 is production of arti9cial light from com3ustion of a gaseous fuesuch as hydrogen, methane, car3on mono4ide, propane, 3utaneacetylene, ethylene, or natural gas.

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LuminescenceIS EMISSI*" *1 LI!H% &' $ S+&S%$"E "*% #ES+L%I"! 1#*MHE$%.

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Radioluminescence

#adioluminescence is light resulting from 3om3ardment 3yioni5ing radiation.

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-hosphorescence

is the emission of light 3y a su3stance that has a3sor3ed light oother electromagnetic radiation.

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Electroluminescence

Electroluminescence is light resulting of an electric currentpassed through a su3stance.

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Laser

light amplifcation by stimulated emission o radiation

 is a device that emits light through a process ofoptical ampli9cation 3ased on the stimulated emission ofelectromagnetic radiation

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LED

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 %H#*+!H I%

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"eon Lights

consists of 3rightly glowing, electri9ed glass tu3es or 3ul3s thatcontain rare9ed neon or other gases. "eon lights are a type ofcold cathode gasdischarge light.