Philips Low pressure sodium-vapour lamps

The Philips Low Pressure Sodium (LPS) Vapour Lamp range offers specialist discharge lighting designed for large-scale outdoor and industrial lighting applications where lumen efficiency is critical and colour rendering is secondary. This technology, built under the “SOX” / “SOX-E” product families, reflects Philips’ heritage in HID/lamp engineering and provides an option where other lighting types may not meet the specific output or cost-efficiency requirements. 

Philips LPS Lamps for Street, Area & Industrial Lighting

Philips LPS lamps are engineered for scenarios such as street lighting, perimeter area lighting, industrial yards, tunnel lighting and security lighting — where high luminous efficacy and long lifetime are essential, and colour fidelity is not the chief priority. 
Key features:

• Exceptional luminous efficacies: for example, the SOX 55 W lamp achieves ~140 lm/W.
• Rated lifetimes up to 18 000 hours (to 50% survival) under recommended operating conditions. 
• Narrow spectral output (~1800 K correlated colour temperature) delivering near-monochromatic yellow light — a trade-off between high efficacy and low colour rendition.
• Zero mercury content (Hg = 0 mg) in many models, aligning with environmental performance goals.

Because of their extreme efficiency, these lamps remain relevant in legacy infrastructure and large outdoor installations where retrofit to LED may still be pending or where ultra-high efficacy is still the overriding criterion.

Philips SOX & SOX-E Families: Technical Highlights

• The “SOX” series includes lamp powers from ~35 W up to 180 W in bayonet base (BY22d) formats; for example: the SOX 135 W has an efficacy of ~167 lm/W. 
• The “SOX-E” variant represents a more efficient economy version (e.g., SOX-E 18 W) and retains the same basic technology in smaller form-factors.
• These lamps require dedicated ballasts/gear designed for low-pressure sodium operation, and correct mounting orientation (especially for higher wattages) for stable performance.
• Because colour rendition is extremely limited (due to monochromatic emission), use is appropriate where visual colour discrimination is not critical — e.g., roadway lighting, perimeter lighting, tunnels

Philips LPS Lamps Portfolio Overview

The portfolio segments into:

• Standard LPS Lamps (SOX) — medium to high wattage lamps (35 W up to 180 W) for outdoor/industrial use.
• Economy LPS Lamps (SOX-E) — lower-wattage models (e.g., 18 W) for specific low-output applications or retrofit scenarios.
• Service/Legacy Modules & Spares — ideal for maintenance of older lighting installations where LPS technology remains in use.

For distributors, this segmentation supports catalogue planning: the standard range addresses large-scale outdoor installations, the economy series supports smaller fixes or legacy replacements, and service spares support maintenance contracts and retrofit-path planning.

Wholesale Supply Advantages with Bank of Lamps

As a professional lighting wholesaler, partnering with Bank of Lamps for Philips LPS lamps offers the following advantages:

• Central EU warehouse (Latvia) ensures better availability of specialist lamps.
• Competitive pricing for bulk orders, important given the niche nature of LPS stock.
• Delivery across Germany, France, Netherlands, Spain, Belgium and Baltic countries
• Verified authentic Philips products with datasheets, warranty documentation and professional support.

These advantages help you support customers in industrial, municipal or infrastructure lighting sectors where LPS lamps are still maintained or specified.