400 W Clear Tubular SON-T Lamp, GES/E40, 2000K, 46mm

  • RS Stock No. 719-3718
  • Mfr. Part No. NAVT400S4Y
  • Brand Osram
Technical Reference
Legislation and Compliance
RoHS Certificate of Compliance
COO (Country of Origin): SK
Product Details

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 NAVT400S4Y.
• 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 4.52 A.
• Nominal voltage 100 V.
• Rated luminous flux 56500 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 440 kWh/1000h.

Mounting Features.

• Any burning position.
• No enclosed luminaire required.
• E40 Base.
• Diameter 47 mm.
• Length 285 mm.
• Light centre length (LCL) 175 mm.
• Weight 171 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.


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 colour 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.


A++, ErP Compliant EU Regulation 245/2009.

Discharge SON Lamps

These lamps combine high efficiency and long life with an improvement in colour 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.

Attribute Value
Wattage 400 W
Lamp Base GES/E40
Lamp Shape Tubular
Lamp Finish Clear
Length 285 mm
Diameter 46mm
Luminosity 56500 lm
Luminous Efficacy 141lm/W
Colour Rendering 25
Colour Temperature 2000K
EU Energy Efficiency Rating A++
66 In stock for FREE next working day delivery
Price Each
£ 20.02
(exc. VAT)
£ 24.02
(inc. VAT)
Per unit
1 +
Related Products
These lamps are single ended, capsule style with ...
These lamps are single ended, capsule style with a 2 pin base. The Elite versions of the lamps have a improved colour rendering and higher efficacy. These lamps are fully compatible with the traditional metal halide type, with the same physical dimensions, also using use the same control gear The ...
Introducing the Ledvance Powerstar® HQ-I® 250 W metal ...
Introducing the Ledvance Powerstar® HQ-I® 250 W metal halide lamp, which produces a high lumen output of 20,000 lm. The clear tubular lamp has an E40 screw base, providing a quick fitment and replacement. Excellent colour rendering of 90 ensures this lamp is great for environments you need good colour ...
The GE G12 Ultra are the new Generation ...
The GE G12 Ultra are the new Generation of 35W and 70W single ended ceramic metal halide lamps. GE’s new Constant Color™ CMH Ultra technology platform has been developed with specific focus to retail applications. GE Ultra technology offers superb overall light quality, outstanding lumen maintenance, improved efficacy, while maintaining ...
The Sylvania HID lamp is a fantastic high ...
The Sylvania HID lamp is a fantastic high pressure sodium lamp. The Sylvania sodium lamp has a long life, uniformity of colour and excellent reliability, the high pressure sodium lamp is an energy efficient product that helps to save you money and reduce energy consumption. Ideal applications for these HID ...