Z8520 Cut Off Use 250W: For use in Groups A1 and A2 at mounting heights of up to 30 ft and in Group A3 at mounting heights up to 35 ft. 400W: For use in Groups A1, A2 and A3 at mounting heights of up to 40 ft.

Z8526 Semi Cut Off Use 250W: For use in Groups A1 and A2 at a mounting height of 25 ft and in Group A3 at mounting height of up to 30ft. 400W: For use in Groups A1 and A2 at mounting heights of up to 35ft and in Group A3 at mounting heights of up to 40 ft.

Lamps
250W or 400W Truelite colour corrected mercury lamp.

Mounting
A side entry socket is provided to accept a 5 in. length of unthreaded 1¼ in. B.S.P.

Lampholder
Porcelain G.E.S wired with heat-resisting insultated wire to a porcelain terminal block.

Construction
The lantern body is an aluminium pressing anodised inside and out, supported by an aluminium alloy end casting. The body is enclosed by a hinged acrylic bowl or toughened glass plate depending on the light distribution and lamp used.

The body pressing is accurately contoured so that the two sides form reflectors to produce light distributions of either cut-off or semi cut-off as required, by B.S. 1788. These alternative distributions are achieved with different sizes of lamp by a two position lamp holder bracket and interchangeable enclosures. All cut-off versions of the lantern are enclosed by a toughened flat glass; semi cut-off lanterns have moulded acrylic bowls. When the lanterns are used with HPS lamps the enclosures have a slight diffusing pattern.

The pressed body is supported by a die cast side entry casting sealed to one end, it is provided with two concealed socket head screws for securing it to the bracket arm. Condensation from the bracket is prevented from entering the lantern by a barrier.

The supply leads are sealed into the body of the lantern through flexible sleeving; this method prevents dirt entering when the lantern breathes and ensures long intervals before cleaning is necessary. A pure wool tropicalised felt gasket between body and enclosing bowl filters any air entering through this joint.

All external fastenings for the enclosures - hinges and toggle catches are made in EN.58 stainless steel.

Weathering Finish
The alloy used is specially selected for its resistance to corrosion. Further protection is obtained by the use of a pretreatment primer and stove enamel top coat.

Illumination Data

Z8520 CO 250W MBF/U	Z8526 SCO 250W MBF/U
Z8520 CO 400W MBF/U	Z8526 SCO 400W MBF/U