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SPECIFICATION

Corrosion resistant die-cast aluminium
alloy (LM6M) canopy and bowl ring;
one piece heat resistant acrylic 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 dirt 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
toggle catches.


Compiles with B.S. 1788: 1964



PERFORMANCE

Cut-off distribution. 250 Watt, suitable
for group A1 roads at 25 ft. mounting
height, group A2 and A3 roads up to
and including 30 ft. mounting height.
400 Watt, suitable for group A1 roads up
to and including 35 ft. mounting height
and for all mounting heights up to and
including 40 ft. on group A2 and A3
roads in accordance with British
Standard Code of Practise CP 1004
Part 2: 1963.



LIGHT DISTRIBUTION DATA

250W WATT MBF/U
 400W WATT MBF/U
Candelas = Intensity ratio x 1022 M.H.I.
Based on an average output of 11,000 Lumens
Candelas = Intensity ratio x 1912 M.H.I.
Based on an average output of 19,000 Lumens
Large Scale Iso-Candle Diagrams and Polar Curves available on request.     ELECO PHOTOMETRIC LABORATORY





Type of Distribution Cut-off
 B.S. 1788:1964
requirements
250 WATT
MBF/U 		400 WATT
MBF/U
Downward light output ratio 99% 98%
Angle of elevation
    Upper limit of beam
    Lower limit of beam
69°
60°
68°
58°
65° must be
within beam
Peak intensity ratio
 3.8 2.935 2.0 - 4.0
Maximum and minimum intensity
ratios in the zone from the
downward vertical to 30° therefrom 		1.934

1.301 		1.875

1.525 		not to exceed 2.0

not less than 0.3
Angle of elevation at which the
intensity ratio is 1.2 in the vertical
plane parallel to the street axis 		73° 77° between 72°-78°
Intensity ratio at the horizontal
in the vertical plane parallel to
the street axis. 		0.146
 0.106
 not to exceed 0.15
Angle of azimuth between
Beam centre and road axis 		8°
 0°
 not to exceed 15°
Light output in lower hemisphere
(downward flux lumens) 		6,425 12,013 See CP 1004
Part 2:
1963 tables
DIMENSIONS



FIXING

Side entry 1¼" B.S.P plain
4" maximum length, secured by two
Allen screws.

Weight 14½ lbs.



ELECO LIMITED · SPHERE WORKS · ST. ALBANS · HERTFORDSHIRE · ENGLAND
Telephone: St. Albans 54524/8     Telegrams: "Voltarcon" St. Albans
The Eleco Policy is one of continued improvement and the right is reserved to improve specifications and materials without notice