mechanical sources of light
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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
LIGH-E!II"G DI#DE. $" ELE%#*"I SEMI*"(+%*#(E/IE %H$% EMI%S LI!H% WHE" $" ELE%#I +##E"% -$SSES
%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.