Whilst being essentially similar in design two units are available, these being for Group 'A' (85/140 watt) and Group 'B' (45/60 watt) Roadway lighting.


Application
For Group 'A' and Group 'B' roads. The lanterns provide a non-cut-off medium angle beam distribution as defined in British Standards 1788 (revised).


Specification
Both units have a cast aluminium canopy with an enclosing 'Perspex' bowl and confrom to the requirements of British Standard 1788 for street lighting lanterns.

The canopy is a single piece silicon aluminium alloying casting with interior painted white and exterior painted aluminium.

Refractor plates are sealed to the inside of the one piece 'Perspex' bowl which is slightly diffused to obscure a direct view of the interior and to aid the daylight appearance of the lantern. The exterior of the bowl is entirely smooth.

The bowl sits evenly on a gasket within the lantern canopy to ensure a weatherproof seal. It is hinged at the roadway end and is held secure at the bracket end of the lantern by a retaining clip.

A terminal block and earth terminal are provided adjacent to the bracket entry. The unit includes a porcelain BC lampholder mounted on a cast bracket at the Roadway end of the lantern.


Light Distribution
Optical control is by means of a sealed in 'Perspex' refractor plates on the inside of the bowl, the remainder of the bowl being slightly diffused. Light distribution is in accordance with British Standards 1788 (revised).


Mounting
Both Group 'A' and Group 'B' versions are arranged for side entry mounting the Group 'A' version being suitable for 1¼" plain BSP 4" long and the Group 'B' version being suitable for ¾" plain BSP 3¼" long. To prevent corrosion th bracket retaining screws are inside the lantern.