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What is the TIR Suffix?

The TIR Suffix is used for fixtures ordered with an instant restrike device which also includes a ballast guard feature. An instant restrike enables a hot HPS lamp to immediately restrike after a momentary loss arc due to voltage fluctuation or power outage. It has no effect on the warm-up period of cold lamps. This feature is only available for high pressure sodium fixtures 50-150W. For details on the ballast guard feature see question 1.