Discharge Lamps VIALOXR NAVR-E 70/E (Standard). VIALOXR NAVR-E (Standard) lamps are quite economical high pressure sodium lamps. Product Description: Survival Factor (LSF) ? 95% after 12,000 h (for P ? 70W). Replacement cycles of 3 years. Average life: 24,000 hours. Applications: Industry. Road lighting. Tunnel lighting. Car parks. Lighting of gardens and parks. Buildings, monuments, bridges.