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==== Halogen infrared reflective (HIR) ==== A further development of the tungsten-halogen bulb has a [[dichroism|dichroic]] coating that passes [[visible spectrum|visible light]] and reflects [[Infrared#Heat|infrared radiation]]. The glass in such a bulb may be [[sphere|spherical]] or tubular. The reflected infrared radiation strikes the filament located at the center of the glass envelope, heating the filament to a greater degree than can be achieved through [[resistive heating]] alone. The superheated filament emits more light without an increase in power consumption.<ref>{{cite web |last1=Group |first1=Techbriefs Media |title=The Rebirth of the Incandescent Light Bulb |url= https://www.techbriefs.com/component/content/article/lighting-technology/lighting-technology/15641 |website=techbriefs.com |date=31 December 2012 |access-date=6 February 2019 }}</ref>
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