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Source Four
The Electronic Theatre Controls (ETC) Source Four (also known unofficially as ''Source 4'' or ''S4'') is an ellipsoidal reflector spotlight (ERS) used in stage lighting. First released in 1992, the Source Four was invented by David Cunningham and features an improved lamp and reflector compared to previous ERS designs, tool-free lamp adjustment, and a rotating, interchangeable shutter barrel.〔(【引用サイトリンク】publisher=Electronic Theatre Controls )〕 The Source Four is widely used by professional theaters across the globe.〔(ETC | Explore the Source Four | Main )〕
==Glass reflector==
The Source Four is the first ERS to use a faceted borosilicate reflector behind the lamp〔〔
. Nearly all stage lights have some form of reflector positioned behind the lamp to reflect otherwise wasted light out of the front of the instrument. The Source Four's reflector is dichroic, meaning that it reflects light of only certain wavelengths. The Source Four's reflector reflects back 95% of the visible light striking it, while allowing over 90% of the infrared radiation (heat) to pass out the back of the instrument.〔〔 This produces a much cooler light which is less destructive to gobos or color gels at the front of the fixture,〔 and reduces localized heating of the lighting target.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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