This lantern is designed for Group B lighting and is therefore very simple, robust and inexpensive. Two types of distribution make it equally suitable for the tree lined residential road or the urban street. It has been accepted by the Council of Industrial Design for Design Index.

Specification

Special Features. The refractor is a two-part assembly of clear plastic injection mouldings, attached by a single-turn thread to a robust diecast aluminium gallery. The exterior is perfectly smooth and the interior vertical prisms have well rounded tips. Thus dirt accumulation is discouraged and the lantern remains remarkably clean for long periods. The refractor is located correctly by a single 'click' spring.

Optical System. The refractor has been specially designed for both tungsten filament lamps and mercury discharge lamps, and gives a broad distribution particularly suited to modern Group B lighting. Since the refractor design was based on a relatively large source from the outset it is recommended that pearl lamps be used although they are not essential. The refractor intercepts an unusually large amount of light from the source, some of which is emitted in the upward direction to avoid a sharp shadow line on buildings and trees. A feature of the refractor is that it is to some extent self-compensating for changes of source position and the normal manufacturing tolerances of lamps have little effect on the distribution of this lantern. Two types of distribution are available, two-way non-axial type particularly suitable for Group B.1 roads and a symmetrical type which meets the requirements for Group B.2 of the C.P. 1004 code of practice.

Materials. The injection moulded reractors, cover and gallery cap are manufactured in special heat and weather-resisting grade of plastic. The interior of the gallery is pressure diecast in aluminium-silicon alloy. The locking spring is stainless steel and the lampholder is porcelain.

Finish. The gallery cap is made from black plastic and the refractor treated with an anti-static compound.

Installation. The gallery has a top entry which is tapped ¾ B.S.P. thread. A locking set screw is incorporated and the road side is clearly indicated.

Lamps. ATLAS 100w, or 150w Tungsten Filament Lamps or ATLAS 80w or 125w Mercury Discharge Lamps.

Catalogue Numbers
Lantern With Sealed Refractor