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Wikipedia: The incandescent light bulb, incandescent lamp or incandescent light globe makes light by heating a metal filament wire to a high temperature until it glows. The hot filament is protected from air by a glass bulb that is filled with inert gas or evacuated. In a halogen lamp, a chemical process that returns metal to the filament prevents its evaporation.
![[Filament of a 200 watt incandescent lightbulb highly magnified]](http://images.ookaboo.com/photo/s/Filament_s.jpg "Filament of a 200 watt incandescent lightbulb highly magnified")
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![[40 watt light bulbs with standard E10, E14 and E27 Edison screw base]](http://images.ookaboo.com/photo/s/Gloedelampe_fatninger_s.jpg "40 watt light bulbs with standard E10, E14 and E27 Edison screw base")
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 from Julo |
from Lysmand |
![[Filament of a burnt]](http://images.ookaboo.com/photo/s/Fused_Electrical_Filament_SEM_Stereo_50x_s.jpg "Filament of a burnt")
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![[Filament of a 50 watt incandescent lightbulb in an SEM in stereoscopic mode, presented as an anaglyph image]](http://images.ookaboo.com/photo/s/Fused_Electrical_Filament_SEM_Stereo_500x_s.jpg "Filament of a 50 watt incandescent lightbulb in an SEM in stereoscopic mode, presented as an anaglyph image")
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 from SecretDisc |
from SecretDisc |
![[Close-up of a tungsten filament inside a halogen lamp.]](http://images.ookaboo.com/photo/s/Tungsten_filament_in_halogen_lamp_s.jpg "Close-up of a tungsten filament inside a halogen lamp.")
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![[The double-contact bayonet cap on an incandescent bulb]](http://images.ookaboo.com/photo/s/BCincandescentlamp_s.jpg "The double-contact bayonet cap on an incandescent bulb")
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from w:Planemad |
from Peterktan |
![[Original carbon-filament bulb from Thomas Edison.]](http://images.ookaboo.com/photo/s/Edison_Carbon_Bulb_s.jpg "Original carbon-filament bulb from Thomas Edison.")
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 from Terren Peterson |
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