| Title |
Reduction of Acoustic Resonance Phenomena in Pulse Start MetalHalide Lamp (MH200W) |
| Abstract |
MetalHalid lamps have good efficiency, good color rendition and good focusing capability. But the shortcoming of metalhalid lamps is known as acoustic resonance phenomena in the arc tube. Such acoustic resonance produce annoying fluctuations in the intensity and distribution of the emitted light, they can raise the voltage to the point where the arc is extinguished, and they can move the arc close enough to the wall to cause local overheating and tube cracking. The objective of this research is to reduce acoustic resonance in the arc tube of the Pulse Start MetalHaide lamp(MH200[W]). To reduce the acoustic resonance phenomena, the electronic ballast was designed for high frequency operation with the constant frequency sinusoidal wave of 89[㎑] in the 84.6[㎑]～94.2[㎑] range. Experimental results show that the acoustic resonance phenomena are not in the arc tube of Pulse Start MetalHalide lamp(MH200[W]). |