Low pressure sodium lamp

When sourcing LPS lamps, prioritize luminous efficacy, which can reach up to 200 lumens per watt, making them one of the most efficient light sources. Ensure the discharge tube is made of borosilicate glass to resist sodium corrosion. Check the operating position (usually horizontal ±20°) and the ballast compatibility, as these lamps require specific leakage transformers or electronic ballasts to initiate the arc.

LPS lamps are ideal for street lighting, tunnel illumination, and security lighting where high visibility is required but color rendering (CRI) is not critical. Due to their monochromatic yellow light (589nm), they are the preferred choice for astronomical observatory zones and fog-prone areas, as yellow light penetrates fog more effectively and causes less light pollution.

Suppliers must provide CE marking for European markets and UL/ETL certification for North America. Ensure the products comply with the RoHS Directive regarding hazardous substances. For international shipping, verify that the packaging meets UN3089 standards for dangerous goods if applicable, as sodium is a reactive metal that requires specialized handling.

LPS lamps typically offer a service life of 18,000 to 24,000 hours. Unlike other technologies, their lumen output does not decrease significantly over time; however, their power consumption increases as they age. Buyers should calculate the Total Cost of Ownership (TCO) by factoring in the rising energy draw toward the end of the lamp's life cycle.

The main risk is physical breakage and chemical hazards. LPS lamps contain metallic sodium, which is highly reactive with moisture. Ensure the supplier uses double-walled corrugated boxes with custom foam inserts. It is mandatory to declare these as Class 4.3 Dangerous Goods (Substances which in contact with water emit flammable gases) unless they fall under specific quantity exemptions.

Request a pre-shipment inspection (PSI) by a third party like SGS or Intertek. Negotiate a warranty period of at least 2 years. Use Secured Trading Services on Made-in-China.com to ensure payment is only released upon confirmation that the goods meet the technical specifications outlined in the Proforma Invoice (PI).

Because LPS lamps contain metallic sodium, they cannot be disposed of in standard waste streams. Buyers must ensure their end-users have access to specialized recycling facilities. When negotiating, ask the supplier if they provide Material Safety Data Sheets (MSDS) to facilitate legal compliance with local environmental protection agencies.

For large volumes, use FOB (Free On Board) terms to maintain control over the freight forwarder and insurance. Since LPS lamps are bulky and fragile, palletization is essential. Consolidating orders into 20GP or 40HQ containers will significantly reduce the per-unit shipping cost compared to LCL (Less than Container Load), which carries a higher risk of mishandling.