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CLEARSIDE 8256 LANTERN
FOR OSRAM FLUORESCENT LAMPS



Specification
Clearside 8256


USE
Side road lighting; the lantern is designed for mounting at heights between 15ft and 18ft and spacing at 100-120ft.

The lantern is very suitable for use on housing estates, especially in new towns.


TUBES
Two 2ft. 40W Osram fluorescent tubes.


MOUNTING
The Z8256 side entry lantern requires not less than 5 in. of horizontal unthreaded 1 ¼ B.S.P. When fully home two 7/16 in. Allen-type grub screws grip the barrel. The design allows for the lantern to be elevated slightly if this is required to add to the appearance of an installation.


LANTERN BODY
One-piece Silicon aluminium alloy die-casting. The gear and wiring necessary to operate the tubes is fitted to a removable tray screwed to bosses in the body casting. The body also carries the two lampholder supports.

An earthing screw, porcelain terminal block and porcelain cable cleat are provided.

OPTICAL SYSTEM
Light control is obtained by two "Perspex" refractor plates. The prismatic sides of the plates are bonded, one to each inner side of a tapered 'Perspex' bowl. Both inner and outer surfaces of the bowl are smooth for easy cleaning. A white over-reflector is a secondary component of the of the optical system. The inside of the body and the ends of the enclosing bowl are given a matt finish to diffuse stray light and give the lantern a pleasing appearance. The enclosing bowl is held to the lantern by stainless steel toggle clips and toggle hinges. 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 pre-treatment primer and silver top coat, stoved on.


Export packing details on application

The Z8256 lantern. The bowl has been lowered to show the tubes.





The polar curve is based on an average tube life output through life from two 40W Osram Daylight fluorescent tubes (2850 lumens average).

1. Light distribution in a vertical plane through maximum intensity.
2. Light distribution around the lantern through maximum intensity.

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 WEIGHT: 24 lb (10.9 kg)