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kirby lantern
Kirby Lantern
Tungsten And Mercury
The Kirby is a low priced lantern with good daylight appearance for 60/200W GLS tungsten or for
80/125W mercury discharge lamps, Types MB/U or MBF/U. It is made in four versions offering alternative forms
of light control.
Application
For Group 'B' roads.
Specification
The canopy is die-cast from LM-6-M silicon aluminium alloy and finished inside and out in
'aluminium paint'. There is adequate movement space inside for mains connection. An earth terminal and grub
screw to secure to a bracket are fitted. The internal reflector plate is anodised aluminium. The hinge-pin
is stainless steel. The pin securing the neat latch between canopy and bowl is phosphor bonze, selected
to give reliable service for many years.
Light Distribution
Overall height 11 3/8" (28-9 cm) diameter 10 1/8" (25-7 cm). Top entry tapping ¾" BSP. Weight of lantern
without glass refractor dome 4½ lbs. (2.0 kg). Weight of lantern with glass refractor dome
6½ lbs (2.8 kg).
Catalogue Numbers
| Refractor dome with stippled 'Perspex' bowl |
| 52/62612 | 150/200W GLS | ES |
| 52/61812 | 80/125 MB/U, MFB/U | 3-pin BC |
| 52/61019 | 60/150W GLS | BC |
| Opal 'Perspex' bowl without refractor |
| 52/62613 | 150/200W GLS | ES |
| 52/61813 | 80/125 MB/U, MFB/U | 3-pin BC |
| 52/61020 | 60/150W GLS | BC |
| 'Oroglass' refractor bowl |
| 52/62614 | 150/200W GLS | ES |
| 52/61814 | 80/125 MB/U, MFB/U | 3-pin BC |
| 52/61021 | 60/150W GLS | BC |
| Glass refractor dome only |
| 52/62615 | 150/200W GLS | ES |
| 52/61815 | 80/125 MB/U, MFB/U | 3-pin BC |
| 52/61022 | 60/150W GLS | BC |
52/62612, 52/61812, 52/61019
A glass refractor dome enclosed by a stippled 'Perspex' bowl provides 2-way non-axial
asymmetrical distribution.
52/62613, 52/61813, 52/61020
An 030 Opal 'Perspex' bowl provides a broad distribution.
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52/62614
52/62613
52/62612
52/62615
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Light Output
Lamp Watts
Lumen Rating |
MB/U
125
4875 |
MB/U
80
2720 |
MBF/U
125
4900 |
MBF/U
80
2720 |
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) |
3559
3097
462
73%
87%
13%
2.23 |
1986
1728
258
73%
87%
13%
2.23 |
3626
2937
689
74%
81%
19%
1.4 |
2013
1631
382
74%
81%
19%
1.4 |
| Conversion Factors. Diagrams are drawn for average conditions of
125W MB/U and MFB/U lamps. For other conditions multiply by conversion factor. |
| Initial lamp output - clean lantern |
1.35 | 0.76 | 1.35 | 0.76 |
| Average lamp output - clean lantern |
1.0 | 0.64 | 1.0 | 0.64 |
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.
Polar Curves
Blue - 52/61812 lantern with 125W MFB/U colour corrected mercury lamp.
Black - 52/61812 lantern with 125W MB/U mercury discharge lamp.
 |
 |
| Polar curve of candlepower in a vertical plane through the main beam at 5o/175o azimuth. |
Polar curve of candlepower in a cone at 75o to the downward vertical. |
Showing curves of equal candle power from a 125W MB/U lamp of average efficiency.
Showing curves of equal candle power from a 125W MBF/U lamp of average efficiency.
Showing curves of equal candle power from a 200W GLS lamp of average efficiency.
Light Output Lamp (GLS) watts
Lumen Rating | 200
2720 | 150
1960 | 100
1260 |
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
1995
164
79%
92%
8%
2.13 |
1556
1438
118
79%
92%
8%
2.13 |
1000
924
76
79%
92%
8%
2.13 |
| Conversion Factors. Diagrams are drawn for average conditions of
200W GLS lamp. For other conditions multiply by conversion factor. |
| Initial lamp output - clean lantern |
1.06 | 0.76 | 0.49 |
| Average lamp output - clean lantern |
1.0 | 0.72 | 0.46 |
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.
Polar Curves
 |
 |
| Polar curve of candlepower in a vertical plane through the main beam at 5o/175o azimuth. |
Polar curve of candlepower in a cone at 75o to the downward vertical. |
Kirby Lantern with 'Diakon' Refractor Bowl
'Diakon' is a clear thermo-plastic, suitable for injection moulding and is virtually unbreakable.
The refractor bowl used on the 'Kirby' is moulded in one piece by a tool the inner portion of which
collapses to facilitate removal of the bowl and ensures accurately moulded prisms. Horizontal prisms are
moulded on the inside of the bowl and vertical prisms on the outside, these are therefore self cleaning
due to the washing action of rain. Hinge and catch blocks are moulded in position.
Light Distribution: two way non-axial.
Mercury Lamps: only the 80W MBF/U lamp should be used in 52/61814.
Tungsten Lamps: 60/150 watt GLS.
Showing curves of equal candle power from an 80W MBF/U lamp of average efficiency.
Light Output Lamp watts
Lumen Rating | 80W MFB/U
2720 |
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) |
2162
1844
318
79.5%
85.3%
14.7%
2.12 |
| Conversion Factors. Diagrams are drawn for average conditions of
80W MBF/U lamp. For other conditions multiply by conversion factor. |
| Initial lamp output - clean lantern |
1.14 |
| Average lamp output - clean lantern |
1.0 |
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.
Polar Curves
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| Polar curve of candlepower in a vertical plane through the main beam at 10o/170o azimuth. |
Polar curve of candlepower in a cone at 72o to the downward vertical. |
Showing curves of equal candle power from an 150W GLS lamp of average efficiency.
Light Output
Lamp Watts
Lumen Rating |
150W GLS
1960 |
100W GLS
1260 |
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) |
1486
1328
158
75.8%
89.4%
10.6%
3.8 |
955
854
101
75.8%
89.4%
10.6%
3.8 |
| Conversion Factors. Diagrams are drawn for average conditions of
150W GLS lamps. For other conditions multiply by conversion factor. |
| Initial lamp output - clean lantern |
1.05 | 0.68 |
| Average lamp output - clean lantern |
1.0 | 0.64 |
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.
Polar Curves
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| Polar curve of candlepower in a vertical plane through the main beam at 12o/168o azimuth. |
Polar curve of candlepower in a cone at 73o to the downward vertical. |
Kirby Lantern with Glass Refractor Dome
The canopy is covered by the specification on page 1 except for the hinge and latch
which are omitted.
The glass dome refractor gives 2-way non-axial distribution.
Polar Curves
A. In vertical plane through the main beam.
B. In a cone at 75o to the downward vertical at 5o/175o azimuth.
1. 'Kirby' lantern 52/61815 with 125W MBF/U lamp.
2. 'Kirby' lantern 52/62615 with 200W GLS pearl lamp.
3. 'Kirby' lantern 52/61815 with 125W MB/U lamp.
The company reserve the right without notice to change the design or the specification of equipment included in this
publication and supplied by them.
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