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Brief Description: High Pressure Sodium , Ideal for applications which are difficult to access, or where maintenance is expensive, the SHP-T/LU Standby Extra 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 which 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 80% over life., Features: Range of high pressure sodium lamps with double arc tube construction Dual arc tube design guarantees immediate re-strike after a power interruption Doubled lamp life and reduced occurrence of early failures Will operate on both Super Imposed and Standard Pulsed Ignitors Exceptional reliability, offering 6 years of maintenance-free service and good lumen maintenance, exceeding 80% over life Where ignitor permits, Sylvania recommends using high performance TwinArc Ideal for applications which are difficult to access, or where maintenance is expensive Perfect for tunnels, airports, military installations, harbours and industrial sites