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40-200 Watt
Filament Lamps

Three Way
(195o 82½o 82½o)
Four Way
(110o 90o 70o 90o)


40 - 200 Watt

Suitable for side streets and rural
main roads of moderate traffic density

(Registered No. 736776 Patent No. 228294)

ESLA, 17 Canterbury
Canterbury 17

general construction

The reflectors consist of one piece castings glazed with silvered glass facets, cut from flat sheet, embedded in a special atmospheric resisting cement. Each facet is set at the exact angle and is of a calculated size to produce the desired light distribution.

Material: Cast iron or Aluminium non-corrosive alloy.
Finish: Green or Aluminium. Other colours to order.
Tapping: ¾" gas thread as standard. Tappings to 1¼" to order.
Lamp Holders: Bayonet Cap or Edison screw. Anti-vibration B.C. type as standard. Rigid Edision Screw or rigid Bayonet Cap when specified.

approximate dimensions and weights

Type Approx Dimensions Approx Weight
Length Width Height Cast Iron Aluminium
Two Way 12¼" 11¼" 10½" 11½ lbs 5 lbs
Three Way 11¼" 11¼" 10½" 10½ lbs 4½ lbs
Four Way 11¼" 11¼" 8½" 10½ lbs 4½ lbs

technical description

The reflectors are designed to produce a light distribution of the required characteristics to ensure good uniformity of illumination and road brightness. The peak candle power is projected at an angle of 10o below the horizontal.

The recommended average economical spacing of posts is ten times the mounting height of the lamp filament.

Type of lamp. B.S.I. type clear gas filled singled coil tungsten filament lamps for standard use. Where the reflectors are installed under aderse circumstances as regards mounting height etc., pearl lamps should be used as explained later. Also, where coiled coil lamps are employed, these should always be of the pearl type unless the mounting height is more than 17'.

mounting height

The table below gives the suggested mounting heights for various wattages. Where the mounting height is less than these values, it is advisable to either use a pearl lamp or one of the numerous grades of semi-diffusing silvered glass instead of the clear mirror glass. Reflectors glazed with different grades of this glass may be loaned for trial purposes and the grade best suited to the conditions can then be chosen.

Wattage 40 60 75 100 150 200
Recommended minium Height to Light centre. 14' 14' 15' 15' 16' 17'-20'

angular settings

The Bi-Multi method of street lighting constitutes a complete system, the reflectors being available in an extremely wide variety of angular settings, which are constantly being added to. We can therefore guarantee to provide a reflector producing the correct distribution of light for every position in a scheme, irrespective of road bends, intersections, varying spacings, road widths etc.

The table below indicates the present range of angular settings, but we make a regular practice of designing special patterns whenever we find unusual positions.

The angles are read in a clockwise direction looking down on the fitting. It must be remembered that the angle of the reflector does not follow the angle of the road. For instance, in the case of a straight road with side of road mounting, 180o reflector is not required, the correct one being usually 165o or 170o. (i.e. ensuring that a minimum of light is wasted on the boundaries of the road.) Another example is an exact 90o sharp bend; here either a 100o or an 80o fitting will be necessary according to whether the post is on the inside or outside of the bend. The general lines of procedure are described in the introductory matter of our general catalogues.

technical service

The personal services of our technical staff at the works are at our clients' disposal at all times. They are prepared to visit a district in order to advise on all street lighting problems, also to inspect every individual lighting position to ascertain the correct reflector, or this latter work can be done reasonably well from plans.

They are also ready to carry out photometric tests on site, for which purpose they are equipped with the latest portable photometers available.

schedule of angles

Two Way Three Way Four Way















120o 120o 120o

130o 130o 100o
130o 110o 120o

135o 135o 90o
135o 112½o 112½o

140o 140o 80o
140o 130o 90o
140o 120o 100o
140o 100o 120o

150o 140o 70o
150o 130o 80o
150o 120o 90o
150o 95o 115o
150o 80o 130o
150o 70o 140o

155o 150o 55o
155o 135o 70o
155o 115o 90o
155o 102½o 102½o
155o 90o 115o
155o 80o 125o
155o 55o 150o

160o 155o 45o
160o 120o 80o
160o 105o 95o
160o 90o 110o
160o 80o 120o
160o 70o 130o
160o 60o 140o

165o 165o 30o
165o 145o 50o
165o 140o 55o
165o 125o 70o
165o 115o 80o
165o 112½o 82½o
165o 105o 90o
165o 97½o 97½o
165o 95o 100o
165o 90o 105o
165o 82½o 112½o
165o 77½o 117½o
165o 60o 135o
165o 45o 150o
165o 35o 160o

170o 145o 45o
170o 100o 90o
170o 95o 95o
170o 75o 115o

175o 115o 70o
175o 45o 140o

180o 125o 55o
180o 120o 60o
180o 110o 70o
180o 100o 80o
180o 95o 85o
180o 90o 90o
180o 80o 100o
180o 70o 110o
180o 65o 115o
180o 55o 125o
180o 30o 150o

185o 145o 30o
185o 80o 95o

190o 95o 75o
190o 90o 80o
190o 85o 85o
190o 75o 95o
190o 70o 100o
190o 55o 115o
190o 40o 130o

195o 130o 35o
195o 115o 50o
195o 100o 65o
195o 82½o 82½o
195o 75o 90o
195o 55o 110o
195o 40o 125o

200o 135o 25o
200o 100o 60o
200o 80o 80o
200o 70o 90o
200o 60o 100o

205o 90o 65o
205o 77½o 77½o

210o 50o 100o

215o 90o 55o

220o 65o 75o

225o 45o 90o

230o 75o 55o

90o 90o 90o 90o

100o 80o 100o 80o
100o 100o 80o 80o

105o 50o 102½o 102½o
105o 80o 85o 90o
105o 90o 65o 100o
105o 90o 75o 90o

110o 70o 90o 90o
110o 80o 80o 90o
110o 90o 70o 90o

120o 40o 105o 95o
120o 80o 70o 90o
120o 100o 90o 50o
120o 105o 40o 95o

121o 73o 100o 66o

125o 50o 105o 80o
125o 70o 90o 75o
125o 90o 80o 65o

130o 35o 125o 70o

135o 65o 95o 65o

140o 70o 55o 95o

145o 40o 120o 55o
145o 55o 75o 85o
145o 65o 70o 80o
145o 75o 85o 55o

165o 15o 155o 25o