GEC Lantern for Super SOX Sodium Lamp
Use
The Z9564 lantern is designed for Group A1 installations with mounting heights up to 40'.
(B.S.C.P. 1004 Parts 1 and 2 1963).
Mounting
A side entry socket is provided to accept a 5" length of unthreaded 1¼" B.S.P.
A baffle is provided at the end of the socket to prevent the entry of water.
Lantern Construction
The lantern complies in all respects with the requirements of B.S. 1788. The body is die-cast
in LM6 silicon aluminium alloy. All external metal parts for the hinges and fastenings are
made in stainless steel.
A special feature is the removable bowl. When the bowl is hanging in the open position, it cannot
be accidentally dislodged, but by turning it through 90° it can be lifted off; there are no
loose parts.
The bowl is formed from Acrylic sheet and has refractor plates cemented on, the prisms are totally
enclosed.
A porcelain B.C. lampholder is fitted. The lampholder is wired to the terminal
block with non-hygroscopic P.V.C. insulated cable.
Optical System
The distribution of the lantern complies with B.S. 1788 types S.C.O.(S). The main beams are
produced by a combination of bare lamp and a double refractor plate. The white enamelled
body casting forms a secondary diffusing reflector over the lamp. The bottom of the bowl is
diffused and is part of the optical system.
Finish
The lantern is supplied with good quality synthetic enamel finish stoved on after pre-treatment
and primer have been applied.
Lamp Operating Gear Recommended
Z1634 Transformer tapped 200/240 volts only.
Z1762 Capacitor 13 m.f.d. 350 volts.
Lantern Weight and Windage
Weight with lamp: 7.06kg.
Windage Area (side elevation): 0.223 sq.m.
(1) Prinicple vertical polar curve through street axis.
(2) Principle conical polar curve.
Isocandela data shown are the mean of two sides and apply for a lamp of 1000 lumens output.
The Z9564 side entry lantern.
Light flux in lower hemisphere (lumens) |
22400 |
See CP1004 Tables 10-16 |
Downwards light output ratio |
0.71 |
No limits specified |
Angle of elevation of upper limit of beam |
76½ |
75° must be within beam |
Angle of elevation of lower limit of beam |
56½ |
75° must be within beam |
Peak intensity ratio |
2.23 |
1.8 to 4.0 |
Maximum intensity ratio in the zone from 0° to 30° |
1.07 |
0.3 to 1.7 |
Minimum intensity ratio in the zone from 0° to 30° |
0.7 |
0.3 to 1.7 |
Maximum intensity ratio 0° to 30° Peak intensity ratio |
0.48 |
0.7 maximum |
Angle at which 1.2 intensity ratio occurs above the peak |
84° |
80° to 86° |
Intensity ratio at the horizontal |
0.57 |
0.7 Maximum |
Divergence of beam centre from the axis of the road in azimuth |
Zero |
15° Maximum |
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