Abstract
Acoustic resonance (AR) occurs in Metal Halide (MH) lamps operating at high frequency, which can cause lamp arc distortion, rotation, extinction and lamp deterioration in the worst situation. AR can break the chemical balance inside arc tube, affecting the spectrum and optical parameters such as the color rendering index (CRI), the correlated color temperature (CCT), and the chromaticity coordinates1. Generally, the light-emitting material in polycrystalline alumina (PCA) bulb of MH lamps is filled with several metal halide salts such as dysprosium iodide (DyI3), thulium iodide (TmI3), holmium iodide (HoI3), thallium iodide (T1I), sodium iodide (Nal). While the buffer gas and the starting rare gas are formed from mercury and argon. Gas discharge works through excitation of the metal halide salts and the mercury is excited by the current flow. The mixture of the visible radiation of the different elements results in the designed CCT and CRI for the lamps.
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