Electrode Constructions of High Pressure Sodium Lamp and Their Life Characteristics

摘要

It is well known that the glow to thermionic-arc transition time of HID lamps when the lamp ignites has close relationship to lamp-life characteristics. High-pressure sodium lamps with five different electrode constructions filled with Ne-Ar Penning gas were used for experiments. It became clear that lighter electrode-weight with emitter had shorter glow to thermionic-arc transition time and showed good life performance, as long as the emitter was shielded from the discharge space.