Benefits
● High luminous efficacy leads to low energy consumption
Features
● Uniform sodium distribution in the discharge tube by means of dimples for a more stable discharge, higher efficacy and better lumen maintenance and lamp life
● Monochromatic yellow color with non-existent color rendering
Application
● Road lighting, railway marshalling yards and crossings, airports, harbours and docks, quarries, foundries and rolling mills.
● Security and orientation lighting.
Versions
SOX
Dimentional Drawing
Product |
D (Max) |
C (Max) |
SOX 35W BY22d |
53 mm |
311 mm |
SOX 55W BY22d |
53 mm |
425 mm |
SOX 90W BY22d |
66 mm |
525 mm |
SOX 135W BY22d |
66 mm |
765 mm |
Approval and Application
Order Code |
Full Product Name |
Energy Consumption kWh/1000 h |
Energy Efficiency Label (EEL) |
928145500008 |
SOX 35W BY22d |
40 kWh |
A+ |
928146000018 |
SOX 55W BY22d |
61 kWh |
A++ |
928146500008 |
SOX 90W BY22d |
100 kWh |
A++ |
928147000008 |
SOX 135W BY22d |
148 kWh |
A++ |
Approval and Application |
General Information |
||
Mercury (Hg) Content (Nom) |
0 mg | Cap-Base |
BY22D |
Controls and Dimming |
Life To 30% Failures (Nom) |
8000 h |
|
Dimmable |
No | Life To 40% Failures (Nom) |
10000 h |
Luminaire Design Requirements |
Life To 8% Failures (Nom) |
6000 h |
|
Bulb Temperature (Max) |
150 °C |
Light Technical | |
Correlated Color Temperature (Nom) 1800 K |
Introduction
Since its commercial introduction in 1932, the Low Pressure Sodium lamp has consistently maintained its enviable position as the most efficient light source available. In recent years, increasing competition from other discharge lamps is resulting in a slow decline in its market, but it continues to be specified for new installations, particularly in Belgium, the Netherlands, and other global regions in the vicinity of important astronomical observation sites in view of the greatly reduced light pollution it causes. The construction of a typical LPS lamp is illustrated in Figure S1.
Figure S1 - A Typical SOX Lamp
Lamp Construction
For reasons of optimal efficacy the sodium vapour is kept at low pressure, which calls for a discharge tube of large dimensions having a relatively low operating temperature. This permits the use of ordinary glass types such as soda-lime silicate or borosilicate, however a protective layer of special borate glass is blown onto the inner surface of the glass tube so as to reduce the rate of attack by the chemically corrosive sodium vapour. To reduce the length of the long discharge tube it is customary to fold it into a U-shape, although linear designs also exist. The discharge tube is dosed with metallic sodium and also contains a rare gas filling, usually neon-based, which facilitates starting. The electric current is supplied via thermionic electrodes at either end, which are similar in construction to those of the low pressure mercury fluorescent lamp, but of somewhat heavier construction on account of the higher lamp currents. The discharge tube requires thermal insulation to ensure a high lamp efficacy, and this is provided by mounting it inside a secondary outer bulb. It is evacuated to minimise thermal conduction and convection losses, and in the more modern lamps is coated on its inner surface with an infra-red reflective film to minimise radiated heat loss. The outer bulb is equipped with either a bayonet or pin-type cap to ensure the correct alignment of the discharge tube in the optical system of the luminaire.
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