![]() For permanent installations use of cast-metal cases is made to achieve robustness and protection against weather and for temporary installations or those in sheltered situations, use of sheet metal casing is made. The casing and its mounting are arranged so that the inclination of the beam can be varied in both a vertical and a horizontal direction on site. Metal reflectors being more robust are usually preferred. This may be made of silvered glass or chromium plate or stainless steel the efficiency of silvered glass is about 90% while that of polished metal is only about 70%. The reflecting surface is the most important part in a projector. Since it is usually installed in remote positions, therefore, it must be robust and weatherproof in construction. The particular type of reflector and its housing used for concentrating the light into narrow beam is known as floodlight projector. ![]()
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