OSRAM VIALOX NAV-T SUPER  4Y High Pressure Sodium Vapour Lamps / Bulbs Open / Closed Luminaires.
Vialox Nav-T are sodium SON-T lamps supplying you with a long-life cycle of up to 36,000 hours and high luminous efficacy plus they are energy saving, up to a 50% saving when replacing mercury vapour lamps. Suitable for use in open and closed luminaires plus can be used outdoors only when matched with appropriate luminaires. The lamps are ErP compliant plus are dimmable on conventional control and electronic control gears.
Features and Benefits.
•    Part NAVT250S4Y.
•    Vialox NAT-T Super 4Y (SON-T lamp).
•    Long life cycle.
•    High luminous efficacy.
•    Energy saving (when replacing HQL mercury vapour lamps).
•    Optimum energy efficient on POWERTRONIC PTo 3DIM ECGs.
•    Dimmable on conventional control and electronic gears.
•    Service lifetime 4 years at 11 hours per day.
•    Average lifetime 36,000 hours.
•    Lamp current 2.95 A.
•    Nominal voltage 100 V.
•    Rated luminous flux 33200 lm.
•    Outer bulb temperature 400°C (maximum permitted).
•    Base edge temperature 250°C (maximum permitted).
•    Operation mode LLMF/LSF 50 Hz.
•    E40 Base.
•    Clear bulb lamp.
•    Mercury content 18.8 mg.
•    WEEE disposal.
•    Dimmable.
•    Energy efficiency class A+.
•    Energy consumption 281 kWh/1000h.
Mounting Features.
•    Any burning position.
•    No enclosed luminaire required.
•    E40 Base.
•    Diameter 47 mm.
•    Length 257 mm.
•    Light centre length (LCL) 158 mm.
•    Weight 165 g.
Typical Applications.
•    Street lights.
•    Outdoor lighting.
•    Industrial installations.
•    Open and closed luminaires.
•    Outdoors with suitable luminaires.
Other Osram SON-T Lamp / Bulbs Available.
•    Stock number 7193702, NAV-T 100 W SUPER 4Y, 100 W, GES/E40 Base,2000K.
•    Stock number 7193711. NAV-T 150 W SUPER 4Y, 150 W, GES/E40 Base,2000K.
•    Stock number 7193714, NAV-T 250 W SUPER 4Y, 250 W, GES/E40 Base,2000K.
•    Stock number 7193718, NAV-T 400 W SUPER 4Y, 400 W, GES/E40 Base,2000K.
Safety Advice.
Disposal of WEEE Directive (Waste Electrical and Electronic equipment). WEEE Regulations 2006. Fluorescent tubes should be discarded safely and securely as per regulation guidance.
Before replacing NAV standard lamps in existing installations always check that the igniters are suitable.
FAQ’s.
What is a Sodium Light Bulb?
A sodium-vapour lamp bulb is a gas discharge lamp that uses sodium to produce a light at a wavelength near 589 nm. Low sodium vapour lamp bulbs are a very efficient light source, however, the yellow light color means that they are only suitable for outdoor lighting.
What is the difference between a Mercury Lamp and a SON lamp?
A Mercury vapour lamp is more involved and the light is white. Sodium vapour lamp bulbs produce a higher light output, approximately 90 lumens / watt and cannot be used in applications when colour rendering is important.
StandardsA+, ErP Compliant EU Regulation 245/2009.
Discharge SON Lamps
These lamps combine high efficiency and long life with an improvement in color appearance and rendering compared with low pressure lamps. SON lamps emit a golden-white light. The SON-T lamp, with its clear tubular outer envelope, lends itself to applications that demand precise optical control, e.g. floodlighting. The SON-E lamp, with its elliptical glass bulb, inside which a white diffusing coating is applied, suits other applications where such accuracy of light control is not so essential. An ignitor (internal or external) is used to supply the high voltage necessary for lamp strike up. Reliable strike up (when hot, less than 60 seconds) thus is ensured, and a simple choke is used to stop excessive voltage rise. The run-up time can be up to 6 minutes when cold.