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High Pressure Sodium Ideal for applications which are difficult to access, or where maintenance is expensive, the SHP-T/SHP-TS TwinArc range are perfect for tunnels, airports, military installations, harbours and industrial sites. This range of high pressure sodium lamps feature a double arc tube construction design with new patented flexible Arc Tube Supports and guarantees immediate re-strike after a power interruption. The range provides exceptional reliability, offering 6 years of maintenance-free service and good lumen maintenance, exceeding 95% over life.