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Designed to use 250 or400 watt MBF/U Lamp
SPECIFICATION
Corrosion resistant die-cast aluminium alloy (LM6M) canopy and bowl ring: one piece heat resistant
acyrlic bowl. Highly polished specular aluminium side reflectors manufactured from super purity
magnesium-aluminium alloy, chemically brightened and anodised. Inside of canopy stoved white, fully
gasketted with neoprene strip to eliminate dirst and moisture; fitted porcelain terminal block,
earth screw and cable clamp. Porcelain G.E.S. lampholder with heat resisting leads. Stainless steel
hinge pins and quick action spring clips.
Compiles with B.S. 1877:1964
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PERFORMANCE
Cut-off distribution, 250 Watt, suitable for group A1 roads at 8m mounting height,
group A2 and A3 roads up to and including 10m mounting height and
400W for all mounting heights up to and including 12m on group A2 and A3 roads in accordance
with British Standard Code of Practice CP 1004 Part 2: 1963.
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LIGHT DISTRIBUTION DATA
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Candela - Intensity ratio x 1022 M.H.I. Based on average output of 11,500 Lumens.
Large scale Iso-Candle Diagrams and Polar Curves availabel on request. ELECO
PHOTOMETRIC LABORATORY.
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Candelas = Intensity ratio x 1912 M.H.I. Based on average output of 20,000 Lumens.
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Photometric Data
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SR 305
Semi-cut-off
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B.S.
1788:1964
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250 WATT MBF/U
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400 WATT MBF/U
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Downward light output ratio
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80%
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72%
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Angle of elevation
Upper limit of beam
Lower limit of beam
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72½°
61°
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68°
50°
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65° must be within beam
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Peak intensity ratio
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2.9
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2.39
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2.0 - 4.0
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Maximum and minimum intensity ratios in the zone from the
downward vertical to 30° therefrom
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1.31
1.06
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1.65
1.26
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not to exceed 2.0
not less than 0.3
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Angle of elevation at which the intensity ratio is 1.2 in the
vertical plane parallel to the street axis
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78°
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78°
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between 72°-78°
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Intensity ratio at the horizontal in the vertical plane parallel to
the street axis
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.075
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.138
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not to exceed 0.15
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Angle of Azimith between beam centre and road axis
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7°
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4°
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not to exceed 15°
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Light output in lower hemisphere (downward flux lumens)
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9,200
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14,400
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See CP 1004 Part 2 1963 tables
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