The LEDVANCE Vialox NAV-T Twin Arc is a specialized High-Pressure Sodium (HPS) lamp featuring two independent arc tubes in one outer bulb, providing exceptional reliability and improved safety. Available in high wattages (250W and 400W) with an E40 base, this tubular Twin Arc HPS globe is ideal for large-scale industrial lighting and critical outdoor area lighting where reliability and long life (up to 48,000 hrs) are paramount.