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 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.
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