目前市售的LED投射燈、檯燈等，在設計燈具時與LED光源最接近的是反射罩或透鏡，但是一般在設計LED反射罩或是透鏡時，都是以遠場Lambertian形式作設計，並無考慮光源在近場光學的特性，又隨著多色LED的普及化，在做反射罩或透鏡設計時，更應該使用近場光學的光強度分佈曲線，故本論文利用點光源疊加之方式先建構出單顆LED近場光強度分佈曲線，在依照此形式推導及建構出Multiple chip之近場光強度分佈曲線，並搭配光學模擬軟體Fred來佐證，最後放置市售反射罩比較單顆LED與多色LED之差異性，由模擬及量測結果得知多色LED必須依照近場光強度分佈曲線來設計其反射罩，否則光強度分佈曲線0度值時會有波谷現象產生，並導致嚴重之設計誤差。

So far most of all reflectors and lens consist with the LED light source, commercial LED spotlight, lamp in the market. But in general, the design reflectors or lens of LED by the type of lambertain. It didn’t consider the near-field optical properties when the reflector or lens of LED was disigned. Due to popularity of multiple chip LED, we should consider the near-field intensity distribution. In this study, we calculated the luminous intensity distribution for single LED by the point source to superposition of way. The result of calculation and construction of the luminous intensity distribution of multiple chip LED in near-field region have to match in optical simulation software “Fred” pattern. Finally we measured in commercial reflector to compare with the single LED and multiple chip LED. The result showed near-field luminous intensity distribution for designing the reflector, or the luminous intensity distribution value will be trough phenomenon on 0 degree, and it will lead to severe deviation for optical design.

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