Energy Education

Halogen light: Difference between revisions

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[[Category:Done 2015-09-05]]  
[[Category:Done 2020-01-31]]  
[[File:halolamp.png|300px|thumb|Figure 1. A xenon halogen light bulb.<Ref>Wikimedia Commons [Online], Available: https://upload.wikimedia.org/wikipedia/commons/4/49/Wolfram-Halogengl%C3%BChlampe.png</ref>]]
[[File:halolamp.png|300px|thumb|Figure 1. A xenon halogen light bulb.<Ref>Wikimedia Commons [Online], Available: https://upload.wikimedia.org/wikipedia/commons/4/49/Wolfram-Halogengl%C3%BChlampe.png</ref>]]
<onlyinclude>'''Halogen light bulbs''' are a fairly efficient [[light bulb]] that produce [[light]] from the flow of [[electricity]]. Halogen lights have many uses in television and film production, home and commercial [[lighting]], and in [[motor vehicle]]s.</onlyinclude><Ref name=ed/>
<onlyinclude>'''Halogen light bulbs''' are a fairly efficient [[light bulb]] that produce [[light]] from the flow of [[electricity]]. Halogen lights are used when filming but are also used in residential and commercial [[lighting]], and in [[motor vehicle]]s.</onlyinclude><Ref name=ed/>


They are an advanced form of the [[incandescent light bulb]], as they work very similarly yet last much longer.<ref name=ed>Edison Tech Center. (Accessed Sept. 2, 2015). ''The Halogen Lamp'' [Online], Available: http://www.edisontechcenter.org/halogen.html</ref> There are two reasons for this:  
They are an advanced form of the [[incandescent light bulb]]; they work similarly yet last much longer:<ref name=ed>Edison Tech Center. (Accessed Sept. 2, 2015). ''The Halogen Lamp'' [Online], Available: http://www.edisontechcenter.org/halogen.html</ref>  
#'''Higher pressures''' - the gas contained within the bulb is at a higher [[pressure]] (7-8 [[atm]]), making the bulb smaller than a normal incandescent. The bulbs must be made from stronger materials to maintain these pressures.
#'''Halogen gas''' - the gas inside of the halogen bulb combines with the [[tungsten]] vapor given off by the filament (the part that gets hot and emits light). If the [[temperature]] is high enough this vapor is redeposited on the filament, recycling the tungsten and extending the bulb lifetime.<ref name=hsw>HowStuffWorks. (Accessed Sept 2, 2015). ''How does a halogen light bulb work?'' [Online], Available: http://home.howstuffworks.com/question151.htm</ref>


#'''Higher pressures''' - the gas contained within the bulb is at a higher [[pressure]] (7-8 [[atm]]), meaning the bulb is much smaller than a normal incandescent. To maintain these pressures without breaking, stronger materials are used.
The bulb is able gets much hotter, producing more light per unit of electricity compared to an incandescent bulb. A drawback is the severe burns halogen bulbs give when touched during operation.<ref name=ed/>  
#'''Halogen gas''' - the gas inside of the halogen bulb combines with the [[tungsten]] vapor given off by the filament (the part that gets hot and emits light). If the [[temperature]] is high enough this vapor is redeposited on the filament due to the bulb's small size, thereby recycling the tungsten and extending its lifetime.<ref name=hsw>HowStuffWorks. (Accessed Sept 2, 2015). ''How does a halogen light bulb work?'' [Online], Available: http://home.howstuffworks.com/question151.htm</ref>
 
Due to these reasons the bulb is able to get much hotter, producing more light per unit of electricity compared to an incandescent bulb. This is fairly hazardous however, as one could get severe burns if they touched it during its operation.<ref name=ed/>  


===Advantages===
===Advantages===
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The [http://phet.colorado.edu/ University of Colorado] has graciously allowed us to use the following Phet simulation. Explore this simulation to see changing temperature changes the amount of radiation given by a light bulb filament. Note that much of the energy is coming off as [[heat]] (in the [[infrared]] spectrum, to the right of the visible spectrum):
The [http://phet.colorado.edu/ University of Colorado] has graciously allowed us to use the following Phet simulation. Explore this simulation to see changing temperature changes the amount of radiation given by a light bulb filament. Note that much of the energy is coming off as [[heat]] (in the [[infrared]] spectrum, to the right of the visible spectrum):


<html><iframe src="http://phet.colorado.edu/sims/blackbody-spectrum/blackbody-spectrum_en.html" width="800" height="600"></iframe></html>
<html><iframe src="https://phet.colorado.edu/sims/html/blackbody-spectrum/latest/blackbody-spectrum_en.html" width="800" height="600"></iframe></html>
 
==For Further Reading==
*[[Blackbody radiation]]
*[[CFL light bulb]]
*[[Incandescent light bulb]]
*[[LED light bulb]]
*[[Lighting]]
*Or explore a [[Special:Random|random page]]


==References==
==References==
{{reflist}}
{{reflist}}[[Category:Uploaded]]

Latest revision as of 05:10, 31 January 2020

Figure 1. A xenon halogen light bulb.[1]

Halogen light bulbs are a fairly efficient light bulb that produce light from the flow of electricity. Halogen lights are used when filming but are also used in residential and commercial lighting, and in motor vehicles.[2]

They are an advanced form of the incandescent light bulb; they work similarly yet last much longer:[2]

  1. Higher pressures - the gas contained within the bulb is at a higher pressure (7-8 atm), making the bulb smaller than a normal incandescent. The bulbs must be made from stronger materials to maintain these pressures.
  2. Halogen gas - the gas inside of the halogen bulb combines with the tungsten vapor given off by the filament (the part that gets hot and emits light). If the temperature is high enough this vapor is redeposited on the filament, recycling the tungsten and extending the bulb lifetime.[3]

The bulb is able gets much hotter, producing more light per unit of electricity compared to an incandescent bulb. A drawback is the severe burns halogen bulbs give when touched during operation.[2]

Advantages

  • Small, lightweight, and easy to produce.
  • A typical incandescent light may last up to 1000 hours, while a halogen light can last over 2500 hours.
  • Halogen lights produce a color temperature closer to that of the Sun, which is more white in color compared to the orange color given off by incandescents.[2] See the PhET simulation below for a comparison: incandescents operate at about 2800 K while halogens get up to 3400 K.[2][3]
  • Longer lifetime, as explained above.
  • Instant startup (no need to warm up)

Disadvantages

  • Extremely hot (burn hazard).
  • Could potentially explode due to high pressure, sending glass shards outward. This may be mitigated by a glass screen which acts as a shield to prevent injury.[2]

Phet Simulation

The University of Colorado has graciously allowed us to use the following Phet simulation. Explore this simulation to see changing temperature changes the amount of radiation given by a light bulb filament. Note that much of the energy is coming off as heat (in the infrared spectrum, to the right of the visible spectrum):

For Further Reading

References

  1. ↑ Wikimedia Commons [Online], Available: https://upload.wikimedia.org/wikipedia/commons/4/49/Wolfram-Halogengl%C3%BChlampe.png
  2. ↑ 2.0 2.1 2.2 2.3 2.4 2.5 Edison Tech Center. (Accessed Sept. 2, 2015). The Halogen Lamp [Online], Available: http://www.edisontechcenter.org/halogen.html
  3. ↑ 3.0 3.1 HowStuffWorks. (Accessed Sept 2, 2015). How does a halogen light bulb work? [Online], Available: http://home.howstuffworks.com/question151.htm
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