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Compact Fluorescent Light Bulb
A compact fluorescent lamp (CFL), also called compact fluorescent light, energy-saving light,
and compact fluorescent tube, is a fluorescent lamp designed to replace an incandescent lamp;
some types fit into light fixtures formerly used for incandescent lamps !he lamps use a tube "hich is
curved or folded to fit into the space of an incandescent bulb, and a compact electronic ballast in the
base of the lamp
Compared to general-service incandescent lamps giving the same amount of visible light, CFLs use
one-fifth to one-third the electric po"er, and last eight to fifteen times longer A CFL has a higher
purchase price than an incandescent lamp, but can save over five times its purchase price in
electricity costs over the lamp#s lifetime Li$e all fluorescent lamps, CFLs contain
toxic mercury "hich complicates their disposal %n many countries, governments have established
recycling schemes for CFLs and glass generally
!he principle of operation in a CFL bulb remains the same as in other fluorescent lighting& electrons
that are bound to mercury atoms are excited to states "here they "ill radiate ultraviolet l ight as they
return to a lo"er energy level; this emitted ultraviolet light is converted into visible light as it stri$es
the fluorescent coating on the bulb (as "ell as into heat "hen absorbed by other materials such as
glass)
CFLs radiate a spectral po"er distribution that is different from that of incandescent lamps
%mproved phosphor formulations have improved the perceived color of the light emitted by CFLs,
such that some sources rate the best 'soft "hite' CFLs as subectively similar in color to standard
incandescent lamps
CFLs typically have a rated service life of ,***+,*** hours, "hereas standard incandescent
lamps have a service life of .* or ,*** hours /o"ever, the actual lifetime of any lamp depends
on many factors, including operating voltage, manufacturing defects, exposure to voltage spi$es,
mechanical shoc$, fre0uency of cycling on and off, lamp orientation, and ambient operating
temperature, among other factors
!he life of a CFL is significantly shorter if it is turned on and off fre0uently %n the case of a -minute
on1off cycle the lifespan of some CFLs may be reduced to that of incandescent light bulbs !he
23 4nergy 3tar program suggests that fluorescent lamps be left on "hen leaving a room for less
than minutes to mitigate this problem CFLs produce less light later in their lives than "hen they
are ne" !he light output decay is exponential, "ith the fastest losses being soon after the lamp is
first used 5y the end of their lives, CFLs can be expected to produce .*+6*7 of their original light
output !he response of the human eye to light is logarithmic !hat is, "hile the human eye is highly
sensitive to changes in the intensity of faint light sources, it is less sensitive to changes in the
intensity of brighter light sources since the pupils compensate by dilating or constricting 3o,
presuming the illumination provided by the lamp "as ample at the beginning of its life, and the light
output of a bulb gradually decreases by 87, vie"ers "ill perceive a much smaller change in light
intensity
http://en.wikipedia.org/wiki/Fluorescent_lamphttp://en.wikipedia.org/wiki/Incandescent_light_bulbhttp://en.wikipedia.org/wiki/Light_fixturehttp://en.wikipedia.org/wiki/Electronic_ballasthttp://en.wikipedia.org/wiki/Luminous_fluxhttp://en.wikipedia.org/wiki/Mercury_(element)http://en.wikipedia.org/wiki/Fluorescent_lamp#Principles_of_operationhttp://en.wikipedia.org/wiki/Color_temperature#Spectral_power_distributionhttp://en.wikipedia.org/wiki/Phosphorhttp://en.wikipedia.org/wiki/Service_lifehttp://en.wikipedia.org/wiki/Incandescent_light_bulb#Voltage.2C_light_output.2C_and_lifetimehttp://en.wikipedia.org/wiki/Incandescent_light_bulb#Voltage.2C_light_output.2C_and_lifetimehttp://en.wikipedia.org/wiki/Voltage_spikehttp://en.wikipedia.org/wiki/Shock_(mechanics)http://en.wikipedia.org/wiki/Operating_temperaturehttp://en.wikipedia.org/wiki/Operating_temperaturehttp://en.wikipedia.org/wiki/Energy_Starhttp://en.wikipedia.org/wiki/Exponential_decayhttp://en.wikipedia.org/wiki/Logarithmic_scalehttp://en.wikipedia.org/wiki/Incandescent_light_bulbhttp://en.wikipedia.org/wiki/Light_fixturehttp://en.wikipedia.org/wiki/Electronic_ballasthttp://en.wikipedia.org/wiki/Luminous_fluxhttp://en.wikipedia.org/wiki/Mercury_(element)http://en.wikipedia.org/wiki/Fluorescent_lamp#Principles_of_operationhttp://en.wikipedia.org/wiki/Color_temperature#Spectral_power_distributionhttp://en.wikipedia.org/wiki/Phosphorhttp://en.wikipedia.org/wiki/Service_lifehttp://en.wikipedia.org/wiki/Incandescent_light_bulb#Voltage.2C_light_output.2C_and_lifetimehttp://en.wikipedia.org/wiki/Incandescent_light_bulb#Voltage.2C_light_output.2C_and_lifetimehttp://en.wikipedia.org/wiki/Voltage_spikehttp://en.wikipedia.org/wiki/Shock_(mechanics)http://en.wikipedia.org/wiki/Operating_temperaturehttp://en.wikipedia.org/wiki/Operating_temperaturehttp://en.wikipedia.org/wiki/Energy_Starhttp://en.wikipedia.org/wiki/Exponential_decayhttp://en.wikipedia.org/wiki/Logarithmic_scalehttp://en.wikipedia.org/wiki/Fluorescent_lamp
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