400W high-pressure sodium tubular lamp with an E40 Goliath screw base. Producing approximately 56,500 lumens of amber 2000K illumination, this Philips HID lamp is ideal for roadway lighting, industrial facilities, warehouses, security lighting, ports, and municipal infrastructure.
What it is
The SON-T 400W E40 Tubular High-Pressure Sodium Lamp is a professional-grade high-intensity discharge (HID) lamp engineered to deliver powerful, energy-efficient illumination across municipal, industrial, commercial, and outdoor environments.
Its clear T46 tubular outer bulb maximises light transmission and reflector efficiency, while the E40 Goliath screw base provides a secure connection in compatible heavy-duty luminaires. Producing approximately 56,500 lumens of characteristic amber 2000K illumination, this lamp offers outstanding efficiency, dependable performance, and long operating life for demanding large-area lighting applications.
Unlike conventional household lamps, this HPS lamp requires compatible 400W HID control gear, including a ballast and ignitor, for safe and correct operation.
Use Cases / Applications
Ideal for high-output commercial, municipal, and industrial lighting applications, including:
- Street and roadway lighting
- Security and perimeter lighting
- Industrial yards
- Factory exteriors
- Warehouses and distribution centres
- Parking areas
- Loading bays
- Railway yards
- Port and harbour facilities
- Agricultural buildings
- Municipal and utility installations
- Existing luminaires designed for a 400W E40 SON-T lamp
Key Benefits
- Produces approximately 56,500 lumens
- High luminous efficacy of approximately 141 lm/W
- Long nominal operating life of approximately 28,000 hours
- Suitable for prolonged nightly operation
- Clear tubular bulb maximises reflector efficiency
- E40 base suits heavy-duty commercial and industrial luminaires
- Reliable replacement for compatible SON-T lighting systems
- Proven Philips technology for roadway, infrastructure, security, and industrial lighting
High-pressure sodium lamps generate light through an electrical discharge inside a sodium-filled ceramic arc tube. This technology produces the familiar amber-gold illumination associated with conventional street lighting while delivering exceptional efficiency and long service life.
Safety Compliance
- Requires compatible 400W HPS control gear
- Requires a compatible ballast and ignitor
- Must not be connected directly to mains voltage
- Allow sufficient warm-up time before reaching full brightness
- Hot restrike may require a cooling period before restarting
- Install only in luminaires designed for 400W HPS lamps
- Isolate power before installation or replacement
- Dispose of responsibly through an approved HID lamp recycling programme
- Requires compatible 400W ballast and ignitor
- Replace only with the same wattage, base type, lamp type, and compatible control gear to ensure safe operation and optimum performance.
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