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Specification Clearside 9480/1 & 9490/1
Use
Side Road Lighting. The lantern is designed for mounting at 13-15 ft. (3.96 - 4.37m) at a spacing
of 100-120 ft. (30.48 - 36.55m). Road width up to 30 ft (9.14m).
Lamp
45W or 60W Osram integral jacket sodium lamp type SOI/H or detachable jacket sodium lamp type SO/H.
Mounting
The Z9480 or Z9490 side entry lantern requires not less than 3 in. (76.2 mm) of horizontal unthreaded 1 in. B.S.P. When
fully home, two 7/16 in. diameter Allen type grub screws grib the barrel. Water running along the bracket arm is prevented from
entering the lantern by a water baffle.
The Z9481 and Z9491 top entry lanterns are tapped 3/4 in. B.S.P. and are supplied with a locknut.
Lantern Body
One piece light alloy die-casting. The Z9480 and Z9481 bodies carry a lamp steady and lamp holder wired with
heat-resisting insulated wire to a porcelain terminal block. An earthing screw and porcelain cable cleat are provided.
In the Z9490 and Z9491 lanterns the body is supplied fitted with a transformer and power factor correction capacitor, these items
being screwed onto bosses in the body casting. Covering the gear is an over reflector finished in glossy synthetic white enamel.
The lampholder is wired with heat-resisting insultated wire to the terminal block on the transformer.
Lampholder
Porcelain B.C. The lampholder position is fixed.
Optical System
Light control is provided by two 'Diakon' injection moulded refractor plates. The prismatic plates are recessed into each side
of a 'Diakon' injection moulded bowl. Injection moulding has many advantages over conventional methods of manufacture. It provides
a very high degree of repetitional accuracy, more efficient light control by the highly finished prisms, has great impact
resistance and is light in weight.
Both inner and outer surfaces of the optikon are smooth for easy cleaning. The ends of the bowl have a clearly defined
moulded diffusing pattern.
The bowl is hinged to the lantern body and fastened by means of a robust stainless steel spring catch. The bowl can be lifted off
the hinges if required to facilitate cleaning. A tropicalised felt gasket between the body casting and bowl ensures a weatherproof
seal when the lantern is closed.
Weathering Finish
The alloy used is specially selected for its resistance to corrosion. Further protection is obtained by the use of a special
one-coat aluminium-finish stove enamel.
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| View showing the general shape of the top entry Z9481/91 lantern. The side entry Z9480 lantern is illustrated on the
front cover. |
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| The Z9491 top entry lantern with the bowl lowered showign the lamp arrangement and the over-reflector covering the
lamp operating gear. |
The iso-candela diagram is based on an average lamp life from a 60W Osram integral sodium
lamp (3,420 lumens average).
| Directional intensity ratio | 2.4:1 |
| Light above horizontal | 13% |
| Light output ratio | 86% |
| Lumens in the lower hemisphere | 2620 |
Light distribution data are given for the guidance of the lighting engineer and represent the
average results of laboratory tests on a number of lanterns taken at random from stock.
The data are based on the tube characteristics stated; if the latest tube efficiency is different,
the candela or lumen values should be calculated in direct proportion to the relative tube
lumens.
Lantern weights: Z9480: 11lb (4.99 kg)
Lantern weights: Z9481: 10lb (4.53 kg)
Lantern weights: Z9490 Complete with gear: 21lb (9.52 kg)
Lantern weights: Z4991 Complete with gear: 20lb (9.07 kg)
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