50W Tubular High Pressure Sodium HPS without ignitor. Brand references to these are Osram NAV T, GE Lucalox T, Philips Master SON T and Sylvania SHP T. When selecting SON T lamps please take care to check if you need Internal ignitor or external ignitor, these are differentiated by a trianlge with an E inside (external ignitor) and an I inside (internal ignitor).
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