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"FACET" DIRECTIONAL LANTERNS
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Z.5225/6/7
For top suspension
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Z.5221/2/3
For sloping side entry mounting
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Sectional scale drawing.
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The iso-candle is based on an average lamp light output through life from a 200 watt OSRAM lamp. (2725 lumens).
| 100 w. | 200 w. | 80 w. | 125 w. | 45 w. |
| Directional intensity ratio | 3.8 | 3.2 | 3.9 | 3.8 | 3.9 |
| Light above horizontal | 20% | 20% | 20% | 20% | 30% |
| Light output ratio | 80% to 85% (covers whole range) |
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"Facet" Directional Lantern.
SPECIFICATION
Catalogue Nos. Z.5221/2/3 and Z.5225/6/7
Use
Side road lighting; mounting height 13 ft. - 15 ft.; spacing 100 ft. - 120 ft. for the best results. Greater spacing will produce
dark areas midway between lanterns. Road width up to 30 ft.
Lamp
| Z.5221 | 60 W., 75 W., 100 W., 150 W. and 200W. OSRAM lamp BC cap, 45W. OSRAM sodium lamp. |
| Z.5225 | 60 W., 75 W., 100 W., 150 W. and 200W. OSRAM lamp BC cap, 45W. OSRAM sodium lamp. |
| Z.5222 | 80 W. and 125 W. OSRAM H.P.M.V. lamp three-pin BC cap. |
| Z.5226 | 80 W. and 125 W. OSRAM H.P.M.V. lamp three-pin BC cap. |
| Z.5223 | 60 W., 75 W., 100 W., 150 W. and 200W. Pearl OSRAM lamp ES cap. |
| Z.5227 | 60 W., 75 W., 100 W., 150 W. and 200W. Pearl OSRAM lamp ES cap. |
Mounting
Two forms of lantern body can be supplied. One is top entry ¾ in. gas, the other is sloping side entry 1 in. gas
barrel unthreaded. In the latter case a ¼ in. Allen grub screw locks the lantern to the bracket.
Lantern Body
Each body is made of die-cast light alloy and consists of two detachable wings, a main body casting and a top, which,
in the case of the sloping side entry form, is a light alloy spinning. An earthing screw is provided.
Lampholder
Three forms of lampholder can be used, BC, three-slot BC and ES.
Optical System
Each wing carries six identical facet mirrors, therse are silvered and lead backed and held in position by lead clips. In
the event of damage, replacement is simple.
The light distribution is very good and the glare ratio conforms to the recommendations of the M.O.T. Final Report 1937,
though it is necessary, when used with H.P.M.V. Lamps, to replace the four lower mirror facets with pot opal facets. If this
is not done, the directional intensity ratio is about 5.5.
Focusing
The lampholder is carried on a bridge piece which slides on two vertical rods. One rod is marked with the correct focal
positions for the various wattages of lamp.
Weathering Finish The light alloy is
spcially selected for its resistance to corrosion. Further protection is obtained by the use of a suitable
primer, undercoat and matt aluminium top coat.
Erection Instructions Full erection and focusing instructions are packed with
each lantern.
APPROXIMATE EXPORT PACKING DETAILS (Standard Case)
Sloping side entry lantern Z.5221/2/3
| 12 |
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| cwt. | qr. | lb. |
| 1 | 1 | 12 |
| (122 Kgs) |
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15.9 cu. ft.
(0.45 cu. metres)
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Top entry lantern Z.5225/6/7
| 50 |
| cwt. | qr. | lb. |
| 2 | 2 | 22 |
| (136.1 Kgs) |
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| cwt. | qr. | lb. |
| 4 | 1 | 0 |
| (215.1 Kgs) |
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47.8 cu. ft.
(1.35 cu. metres)
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