Patt.765
(Replaced by the Solo range in ?1984)
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From "Highspot" leaflet (undated) Rank Strand introduce the Pattern 765, a new follow spot, with outstanding performance characteristics, utilising the ultra-efficient Compact Source Mercury Halide light source. Conventional tungsten filament projector lamps have an energy light conversion efficiency of around 20 lumens per watt. Short-life, high performance Class CP tungsten halogen lamps attain 26 lumens per watt but the Compact Source Mercury Halide (C.S.I.) lamp is truly remarkable as it gives a four-fold increase to 85 lumens per watt in a compact envelope which allows efficient optical control of this bright source. Being a discharge lamp it cannot be dimmed by varying the line voltage and it is this which precludes it's use for stage lighting. It is however ideal for a followspot where the high intensity is of greater importance than the convenience of remote control. A special dimming shutter is available so that the beam can be dimmed by the operator if required. The Pattern 765 C.S.I. followspot employs the new 1000 watt C.S.I. lamp in an efficient optical system to provide an exceptional follow spot, one which is far less bulky than those with a carbon arc light source which have been previously necessary. The starting equipment is contained within the lamphouse, only a compact regulation unit being external. The gate is fitted with an iris diaphragm, horizontal and vertical stripping shutters. The beam spread provided by the double plano-convex lenses is 14deg max. Max width 17" (430mm). DOWNLOAD:
From Rank Strand brochure (undated) This follow spot is specially
designed to use the robust, single-ended 1000W compact source discharge lamp which
is between three and four times more efficient than a tungsten halogen filament
lamp. This superior light source complete with the efficient reflector collection
and large diameter lenses ensures that the model 765 provides exceptional performance. 765 Follow Spot
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