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Clearspace 8453 Lantern
For Osram Fluorescent Tubes

Specification Clearspace 8453

Use
Side road lighting, mounting height 13-15 ft (3.96m - 4.57m), spacing 80-100 ft (24m - 30m). The lantern is also very suitable for decorative garden, promenade and balustrade lighting, new housing estates, space lighting in front of offices, blocks of flats, halls, etc.


Tubes
Two 2ft (610 mm) 40W Osram fluorescent tubes type MCFA/U. Switchless start.


Mounting
Post top spigot cap for a 3in (76.2 mm) dia. x 3in (76.2 mm) high spigot. The lantern is secured by three 7/16 in dia. Allen type grub screws in the spigot cap.


Lantern Body
In the main, the lantern body is a 'Perspex' cylinder through which run two parallel straps carrying the tube operating gear, which is supplied fitted in the lantern. The straps also carry the locating clips for the fluorescent tubes. The cast-iron spigot cap is secured to the straps.

Two aluminium spinnings are combined in the top of the lantern. The lower rests on the upper rim of the 'Perspex' cylinder making a weatherproof seal when the main body is closed. The complete 'mushroom' canopy is secured by a cast aluminium knob which, when screwed down, makes the lantern totally enclosed and weatherproof.

Optical System
The tapered cylindrical 'Perspex' body incorporates two vertically mounted sealed-in machined 'Perspex' refractor plates - a unique feature.


Weathering Finish
The cylinder is made of 'Perspex'. The finial and all top and bottom spinnings are of aluminium. All are finished a handsome high gloss bronze.



The lantern with the top canopy and 'Perspex' cylinder removed showing the tube operating gear.




The polar curves is based on an average tube light output through
life from two 40W Osram Daylight fluorescent tubes (2880 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: 28lb (12.7 kg).


Part of an installation of Z8453 lanterns in Crawley New Town. The lanterns are mounted on GEC concrete columns.