在LED光源模組中，反射罩和透鏡是緊貼著光源的。但是在一般在設計反射罩和透鏡時，都是假設LED是一個Lambertian的點光源分佈。在設計透鏡和反射罩時並沒有考慮光源在近場的光學特性。又現在常用的COB多色LED，不應該再使用Lambertian為光源來做處理，而是應該考慮近場光強度分佈。在本論文中，單顆LED光強度分佈的方式是利用一個點光源在LED中心位置的提升。此模型可以簡單代表單顆LED的近場光強度分佈。此外，也將這個單顆LED模型運用在多色LED模型上。並利用一個COB多色LED路燈來做驗證，實際近場光強度分佈曲線相當接近在光學軟體上模擬的結果，而且跟使用Lambertian模型的有所差異。

In LED light module, it consists of reflectors and lens. But in general, the design of the reflectors or lens is based on assuming the LED to be a point source with Lambertian distribution. It didn’t consider the near-field optical properties when the reflector or lens of LED was designed. Due to popularity of multiple chip LED fabricated in chip-on-board(COB), this is no longer treated as a Lambertian light source and the near-field intensity distribution should be considered. In this study, the luminous intensity distribution of a single LED is modeled as a point source shifting vertically from the center of the LED. The near-field luminous intensity distribution of an LED can be obtained by this LED model. Furthermore, this single LED model is extended to multi-LED model easily. A street lamp with multi-LED COB is tested. The near-field luminous intensity distribution is measured and is found to be close to the distribution obtained by the optical simulation software, which is quite different from the one obtained by Lambertian model.

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