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Gamma Five lantern on 1500/G5 steel column
atlas gamma five
post top lantern

This unit represents a new approach to the problem of matching column and lantern for Group 'B' lighting. The lantern and column have been designed as one unit to present a pleasing daylight appearance. The lantern and column have been accepted by the Council of Industrial Design for Design Index.


Special Features. The globe forms a structural part of this lantern and is formed from extra thick plastic sheet. Apart from the mechanical advantages, the simplicity afforded by this construction makes the lantern particularly resistant to malicious damage. The globe is attached directly to the belled out end of the column and access is gained by hinging back the canopy. Standard lanterns use either tungsten or mercury fluorescent lamps. Details available on request for a modified lantern to accommodate 60 watt sodium lamp.

Optical System. The lantern is available is symmetric or asymmetric refractors with a clear plastic globe. Alternatively it may be used without refractors and with an opal globe to give a general distribution for amenity lighting.

Materials. The canopy is made from an aluminium spinning and a diffusing bowl from plastic. Stainless steel is used for components that might otherwise corrode. An impregnated rot-proof felt gasket forms the seal between the plastic bowl and the canopy, and the join between lantern and column is made by a neoprene foam sealing ring.

Finish. The canopy is specially treated with a 'Miracyl' enamel to ensure a lasting finish. The internal parts of the canopy are also finished in 'Miracyl' enamel.

Installation. The lantern is securely fixed to the top of the column by two ½" Whit. bolts. The special steel column Cat. N. 1500/G5 or aluminium column Cat. No. Z3393 is required for mounting the lantern. A spigot cap Cat. No. PW4601 for 3" column can be supplied if required.

Lamps. ATLAS 150 or 200 watt tungsten filament, or 80, 125 watt MB/U or MBF/U.

Catalogue Number.
Lanterns with Clear Bowl

Asymmetrical Symmetrical
100-150 watt GLSPWB/Y/2BC 1200PWB/X/2BC 1200
150-200 watt GLSPWB/Y/ES 1200PWB/X/ES 1200
80-125 watt MB/U or MBF/U    PWB/Y/3BC 1200     PWB/X/3BC 1200    

Lanterns with Opal Bowl

100-150 watt GLSPWD/2BC 1200
150-200 watt GLSPWD/ES 1200
80-125 watt MB/U or MBF/U    PWD/3BC 1200

For complete catalogue numbers and ordering guide see separate list included in catalogue.

Isocandle diagram of asymmetric lantern, based on average light output of 2900 lumens throughout the life of 200W GLS lamp.
Technical Data

For 80 watts MBF/U lamp.

Average light output throughout life:2720 lumens
Light output ratio:.72
Light output ratio above horizontal:.03
Light output ratio below horizontal:.69
Light output in lower hemisphere1800 lumens
Light output per 100 linear feet of footway at:    
    90 ft. spacing2090 lumens
    100 ft. spacing1880 lumens
    110 ft. spacing1710 lumens
Directional intensity ratio:1.3
Total circuit rating:90 watts
Overall diameter:17½ ins. 44.45 cms.
Overall height:9 ½ ins. 24.13 cms.
Weight:8 lbs. 3.63 kg.
Conversion factor for 125 watt MBF/U:1.79
Conversion factor for 150 watt GLS:0.76
Conversion factor for 200 watt GLS:1.07