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Gamma Two on 1510 steel column


atlas gamma two
vertical fluorescent lantern


Appearance, elegance and slim modern lines are the dominant feature of this lantern. With its all-round distribution of light, its main use will be for lighting avenues, promenades, ornamental gardens and those streets which are the object of particular civic pride.


Specification


Special Features. In this lantern the plastic diffuser and cap are manufacturered as one piece which stands on a small ring gasket at its lower end. By means of a large clamping screw, which passed thorugh a gland attached to the cap, the diffuser is tightened down on to the gasket, thus virtually achieving an hermetic seal. In this way, no attention is needed between tube changes - an infrequent operation with the long, reliable life of an ATLAS fluorescnet tube.

The Gamma Two lantern incorporates starter switches only, for two or four 2ft. 40W tubes. The remainder of the control gear (less P.F.C. capacitor) is supplied on a ballast tray for mounting in the base of the column.



Materials. The diffuser is manufactured from opal plastic sheet, the cap being of the same material but coloured and cemented to it. The base is a substantial casting of corrosion-resisting aluminium silicon alloy.



Finish. The diffuser and cap are treated with an anti-static compound. The base is "Bonderite" processed and stove enamelled grey.



Installation. The Gamma Two requires a 3" by 3" diameter spigot. The gear tray to which the chokes only are fitted and the capacitor, should be mounted remote from the lantern.



Lamps. Four ATLAS White 2ft. 40W tubes.



Catalogue Numbers.

PVD/B/S4240.T4 Tube lantern and gear tray
C2125Capacitor. Plus Y5242 fixing clip
PVD/B/S2240.T2 Tube lantern and gear tray
C2123Capacitor. Plus Y5242 fixing clip




Polar diagram of Gamma Two lantern for a total tube light output of 6080 lumens.
Technical Data

Atlas fluorescent lamps:4 x 2ft. 40W White
Average light output throughout life:6080 lumens
Light output ratio:0.72
Light output ratio below horizontal:0.37
Light output ratio above horizontal:0.35
Light output below horizontal:2250 lumens
Light output per 100 linear feet of footway at:    
    100 ft. spacing2250 lumens
    120 ft. spacing1880 lumens
Total circuit rating:192 watts
Overall length:32ins. 81.28cms.
Overall diameter:11ins. 27.94cms.
Total Weight:13.1lbs. 5.84kg.
Dimensions of Ballast Tray Cat. No. PV.4240.T and PV.S2240.T:
    Length:7½"
    Width:4 1/16"
    Height:2 /58"
    Fixing Centres:3"
Spare starter switchSGD 1239