| Summary: | 碩士 === 中華大學 === 機械工程學系碩士在職專班 === 100 === Microwave Sulfur Lamp is known as an electrodeless lamp with full spectrum that is very close to that of the sun light. The Sulfur within the quartz bulb was excited by the microwave emitted from the magnetron. The microwave electrodeless Sulfur lamp features high luminous efficiency, long life time (60000 hours), good color rendering, Mercury pollution free, and good light maintenance factor . With the higher power input, the microwave electrodeless Sulfur lamp is appropriate for open area outdoors lighting, plant factory, and sun lighting simulator.
In this study, the major fabricating parameters of the microwave electrodeless Sulfur lamp have been studied and evaluated their effects to the lighting performance. The study consists two parts: the first part is fabricating a microwave electrodeless Sulfur bulb, which is powered by a microwaved power supply. The spectral distribution of the bulb was examined by Spectrometer and compared to that of the sun light. The second part is to the interactions between the brightness, color temperature, and other performance of the bulb and the fabricating parameters such as: the filling volume of Sulfur, the filling volume of Inert gas, the power of the microwaved power supply.
The results from first part had shown that the fabricated microwave electrodeless Sulfur lamp has a continuous spectrum between 400 nm to 1100 nm. However, the spectrum of a pure Sulfur lamp has lower intensity between 700 nm to 1100nm, i.e. while increasing the filling volume of Sulfur and trace metal halides during the fabrication, the intensity of the microwave bulb is increased dramatically from red to the infrared region of the spectrum.
From the results from the second part, it is found that the filling volume of the Sulfur will give raise to the changes of spectral distribution, brightness, and color temperature of the bulb. Meanwhile, the inert gas also has shown the slight effects on the brightness, and color temperature of the bulb. It is also found that the more rapid change of the brightness of the bulb would be corresponded to the larger input power. With the input power from 800W to 1200W, the brightness of the bulb would increase about 170%.
With the obtained results, it is possible to optimize the filling volume of the Sulfur and the input power, the brightness of the microwave electrodeless Sulfur lamp is able to be increased up to 230%, from 1201cd/m2 800W to 2812 cd/m2 1200W. The further studies will be carried on.
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