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ashby lantern and 'leader' 15 aluminium column

The Ashby lantern and the Leader 15 Aluminium Column have been approved as a unit of street furniture for inclusion in the 'Design Index'. Designer: Jack Howe, FRIBA, FSIA, Design Consultant to AEI Lamp and Lighting Co. Ltd.




Ashby Lantern
The Ashby is an enclosed lantern of aluminium and opal 'Perspex', designed primarily for residential areas. In combination with the Leader column its appearance is unmatched both by day and night. It can be specified without hesitation for any situation where looks and the colour quality of light are important.

Lamps. For one 100/200W tungsten filament or one 80/125W mercury (MB/U) or colour corrected mercury (MBF/U).




'Leader' 15 Column
The new 15 ft. 'Leader' aluminium column is light - it can readily be carried by one man - and strong. The appearance of the metal surface is agreeable and it does not need the protection of paint except in localities where the atmosphere is exceptionally corrosive. 'Leader' columns are made by a recently intorduced extrusion technique, operated exclusively by AEI Lamp and Lighting Co. Ltd, from magnesium silicon aluminium (RTI 441-EP), the alloy specified for resistance to weather. The column illustrated is the 'Leader' 15, a slim, tapering triangular section shaft, secured to a similar triangular base by a shoulder casting. Others are 'Leader' 15T, extruded, but with a full length tapering triangular section, and 'Leader' 15R, a tapering tubular column.




Catalogue Numbers




Cat No. Lamps Lampholder
Ashby Lantern
SL 3746 60/150W GLS BC
SL 3747 200W GLS BC
SL 3748 80/125 MB/U, MBF/U 3-pin BC
Ashby Lantern on a 'Leader' 15 Column
SL 3790 60/150W GLS BC
SL 3791 200W GLS BC
SL 3792 80/125 MB/U, MBF/U 3-pin BC






Specification
The canopy is an aluminium spinning. The spigot cap is cast in LM6M aluminium alloy. The bowl is 030 Opal 'Perspex' and the junctions with canopy and spigot cap are sealed by neoprene gaskets. Internal fittings are mild steel finished in cadmium plate.


Dimensions
Overall diameter 20½" (52.1 cm)
Overall height 14¾" (37.5 cm)
Weight 14lb. (6.35 kg)

The company reserve the right without notice to change the design or the specification of equipment included in this publication and supplied by them.


Light Output
Lamp (MB/U) Watts
Lumen Rating

125
3875

80
2480
Total light output of lantern - lumens
Light output in lower hemisphere - lumens
Light output in upper hemisphere - lumens
Total light output ratio
Percentage of lantern in lower hemisphere
Percentage of lantern output in upper hemisphere
Direction Intensity Ratio (B.S. - CP 1004)
2159
1790
369
56%
82.9%
17.1%
1.19
1382
1146
236
56%
82.9%
17.1%
1.19
Conversion Factors. Diagrams are drawn for average conditions of 125W MB/U lamps. For other conditions multiply by conversion factor.
Initial lamp output - clean lantern 1.350.76
Average lamp output - clean lantern 1.00.64

Light Distribtion data are only given for the guidance of the Lighting Engineer and represent the results of laboratory tests on a typical lantern taken from stock. The data are based on the lamp characteristics stated; if the latest lamp efficiency is different, the candela or lumen values should be calculated in direct propotion to the relative lamp lumens.





Mean polar curves in a vertical plane
Ashby lantern SL 3748
1-125W MB/U lamp. Lumen rating 3875.
Ashby lantern SL 3747
1-200W GLS pearl lamp. Lumen rating 2720.y