鲍里斯·约翰逊(Boris Johnson)宣布伦敦交通局将安装超过1万盏LED灯，相比现在的灯泡，每个LED都将更节约能耗，并且可以减少60%的碳排放。
Boris Johnson said Transport for London (TfL) will install more than 10, 000 LEDs, each of which is expected to cut energy use and carbon emissions by 60 per cent compared to existing bulbs.
室内光源有碳弧光灯，白炽灯及石英灯等。室内的主光源是聚光灯和散光灯、泛光灯。聚光灯将光聚到一起。
Indoors light is furnished by carbon arc lamps incandescent bulbs and quartz bulbs. the basic indoor lights are spotlights and floodlights. spotlights throw a beam of concentrated intense light.
红外线：从碳弧灯或氙弧发出的不可见的、长波长的辐射，它对胶片和设备传送热量。
Infrared: Nonvisible, long wavelength radiation from a carbon or xenon arc that contributes to the heating of the film and equipment.
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