Use
Main road lighting. For mounting at a height of 25 ft (7.62 m); spacing 100-150 ft. apart (30.48-45.72 m). Road width up to 40 ft. (12.19 m). On account of its good colour rendering this lantern is most suitable for civic centres, main shopping areas and promenade lighting at seaside resorts.

Tubes
Two, three or four 5 ft (1.52 m) 80W Osram fluorescent tubes, type MCF/U.

Mounting
The lantern is suitable for any type of column and requires a 2 in. B.S.P. (2.3/8 in (60.3 mm) outside dia.) plain steel tube 3 ft. (0.91 m) long.

Body
The lantern body consists of two die-cast light alloy end-pieces built on to a 9 in. aluminium alloy extrusion. Two die-cast aluminium alloy sleeves are incorporated in the body to receive the bracket arm. Three 7/16 in. dia. Allen-type grub screws secure the bracket arm in the sleeves. All the auxiliaries necessary to operate the tubes, together with the wiring harness and lamp-holders, are carried within the lantern body on a quickly detachable die-cast aluminium gear tray. The gear is enclosed by an aluminium over-reflector hinged on one side and secured when closed by four captive quick-release turn buttons. The underside of the reflector carries the brackets supporting the uppermost fluorescent tube(s).

Optical System
Light control is provided by two 'Perspex' refractor plates. The prismatic sides of the plates are bonded one to each inner side of a 'Perspex' bowl. Both inner and outer surfaces of the bowl are thus smooth for easy cleaning.

The bowl is hinged to the lantern body by stainless steel hinges and fastened by means of robust stainless steel spring catches. All the hinges and catches are inside the weathering skirt of the lantern body, giving a smooth and neat appearance. A trpicalized felt gasket between the body and the bowl ensures a weatherproof seal when the lantern is closed. The lower fluorescent tube is located in clips at the bottom of the bowl.

Note: A tapered "Perspex" bowl instead of the standard parallel type can be supplied to special order.

Weathering Finish
The lantern is made entirely of aluminium alloy extrusions and castings, with stainless steel catches and hinges. The careful attention to the selection of materials both for their own properties and their effect on one another eliminates the corrosion problem. Final protection is obtained by the use of a special one-coat aluminium-finish stove enamel.

Auxiliaries
The lantern is supplied with the gear tray equipped with all the auxiliaries necessary to operate the tubes and is completely wired up to a fused connector block ready to receive the cable supply.

The Z8270 lantern. The stainless steel spring clips securing the bowl has been released and the arrangement of the two fluorescent tubes can be seen.
The Z8370 lantern. The bowl has been lowered showing the arrangement of the three fluorescent tubes.
The Z8470 lantern. The stainless steel spring clips securing the bowl has been released and the arrangement of the four fluorescent tubes can be seen.

	The iso-candela diagram is based on an average light output through life from two 80-watt Osram White tubes (9280 lumens average). Directional intensity ratio: 2.58:1 Light above horizontal: 30% Light output ratio: 73% Lumens in the lower hemisphere: 4,700 Light distribution data are given for the guidance of the lighting engineer and represent the average results of laboratory tests on a number of lanterns taken at random from stock. The data are based on the tube characteristics stated; if the latest tube efficiency is different from the candela or lumen values, should be calculated in direct proportion to the relative tube lumens. Lantern Weight with gear: 46½ lb. (21.13 kg). Total length: 69 in. (175.3 cm).
	The iso-candela diagram is based on an average light output through life from three 80-watt Osram White tubes (13920 lumens average). Directional intensity ratio: 2.73:1 Light above horizontal: 28% Light output ratio: 70% Lumens in the lower hemisphere: 7,200 Light distribution data are given for the guidance of the lighting engineer and represent the average results of laboratory tests on a number of lanterns taken at random from stock. The data are based on the tube characteristics stated; if the latest tube efficiency is different from the candela or lumen values, should be calculated in direct proportion to the relative tube lumens. Lantern Weight with gear: 53½ lb. (24.23 kg). Total length: 69 in. (175.3 cm).
	The iso-candela diagram is based on an average light output through life from four 80-watt Osram White tubes (18,560 lumens average). Directional intensity ratio: 2.53:1 Light above horizontal: 27% Light output ratio: 60% Lumens in the lower hemisphere: 8,00 Light distribution data are given for the guidance of the lighting engineer and represent the average results of laboratory tests on a number of lanterns taken at random from stock. The data are based on the tube characteristics stated; if the latest tube efficiency is different from the candela or lumen values, should be calculated in direct proportion to the relative tube lumens. Lantern Weight with gear: 60½ lb. (27.43 kg). Total length: 69 in. (175.3 cm).

The lantern body with the over-reflector carrying the uppermost fluorescent tubes lowered. The bracket mounting sleeves together with the detachable gear tray can be seen.

All the auxiliaries necessary to operate the tubes, together with the wiring harness and lamp-holders are carried within the lantern body on a quickly detachable die-cast aluminium gear tray. The simplicity of this unit can be seen in the photograph.