Use
The lantern is designed for mounting at 15-21 ft. and spacing at 100-120 ft. and is suitable for roads of up to 40 ft. in width. Its colour rendering and good architectural appearance makes it suitable for civic centres, main shopping areas and seaside promenade lighting. The lantern has a low surface brightness.

Tubes
Four 5 ft. 80W Osram fluorescent tubes type MCF/U.

Mounting
The standard lantern is designed for post top mounting on a spigot 6 in. high by 4 in. diameter. Alternatively it can be supplied for mounting on a spigot 6 in. high by 4.1/2 in. diameter. The lantern is secured by six Allen type grub screws in the cast-iron spigot cap.

Lantern Body
The lantern body is essentially an unplasticized "Perspex" cylinder. Through this runs a 1.1/4 in. B.S.P. steel barrel which, at its lower end, screws into the cast-iron spigot cap.

The lower copper spinning encloses the auxiliaries necessary to operate the tubes. The auxiliaries are secured to the centre barrel by cadmium plated steel straps. At the upper end of the steel barrel is secured a cadmium plated steel spinning.

The tubes are supported by fixed backplate lampholders at the lower end and by stainless steel Terry clips at the top. Floating lampholders at the top complete the electrical contact.

The "Perspex" cylinder fits over this assembly, resting on the lower spinning. The top spinning, which is also of copper, is secured by a spun copper finial, which, when screwed down, makes the lantern totally enclosed and weatherproof. The lantern is supplied already wired internally.

Optical System
The opal "Perspex" cylinder provides a diffusive symmetric light distribution.

Weathering Finish
All metalwork is primed and the interior surfaces stove enamelled white. The exterior components have a handsome bronze finish.

The lantern with "Perspex" cylinder and top spinning removed showing the auxiliary gear and tube arrangement.

Light distribution in a vertical plane through maximum intensity. The polar curve is based on an average tube light output through life from four 80W 5 ft. Osram White fluorescent tubes (16,640 lumens average). 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 lamp characteristics stated; if the latest lamp efficiency is different, the candela or lumen values should be calculated in direct proportion to the relative lamp lumens. Lantern weight: 90lb (41 kg).

Part of an installation of G.E.C. Z8480 fluorescent lanterns at Rayleigh, Essex.