照明是人類的基本需求，由於近年環保意識抬頭，因此相較於一般的傳統燈具，發光二極體(LED)省電、環保等優點，已讓許多科技業者已致力於LED技術開發，作為取代燈泡的重要光源。LED在亮度及使用壽命上目前還無法達到一般照明水準，其中一個十分重要的原因在於LED封裝體在發光時會產生熱量，因此若燈具的散熱設計不佳，會影響整體燈具之發光效率；另外LED為點光源，晶片中心的光通量很高，因此使用在燈具照明上，容易造成使用者在視覺上的不適。本論文針對上述兩項LED燈具於照明上所遭遇的瓶頸，設計一款適用於室內照明之E27 LED燈具；此燈具之散熱模組包含一軸流式風扇作為主動式散熱元件，及寬1.1 mm、長19 mm之散熱鰭片；研究的方法，首先了解此散熱模組能夠接受LED功率過載的程度，並測量不同驅動功率下LED的溫度變化，並由此了解適合於燈具之最佳功率，以LED光源選擇、風扇尺寸及LED光源固定方式作為散熱模組最佳化測試參數。於光學設計上，以分散光源為主要目的，設計兩組出光方向：Down-light及Side-light，並探討於不同驅動功率下對燈具出光角度及光源分佈之影響。此研究設計之E27 LED燈具可應用於次要室內照明上。

The illumination has been essential to human life.LEDs offer a number of huge advantages over traditional light sources such as low energy consumption, eco-friendlier and so on; moreover, it will revolutionize the lighting industry to replace conventional bulbs in time for the growing environmental consciousness of today. Though people have dedicated in LED technology for years, the brightness and the longevity of LEDs can not reach the standard of the regular lightning facilities. One of the most important reasons for low luminous efficiency is the inadequate cooling design which will cause LED package to generate heat. The point light LEDs have high luminous flux at chip center, and it will lead to visual discomfort. The study takes aim at those problems as mentioned above. My design- E27 LED Lamps is an adequate house use lighting facility. Its cooling module includes two parts: one is the axial flow fan uses as an automotive cooling component, and another is the Heat Sink with 1.1 mm in width 19 mm in depth. First of all, the experimental study determined the optimal parameter by finding maximal power over-drive of cooling module; measuring the variation between LEDs’ temperature and its electrical efficiency, and choosing the light source, size of fan, a method under a fixed LED light source as to be the optimal parameter of cooling module. The main purpose of dispersion of the light in optical design is to arrange Down-light and Side-light, and to discuss outcomes under different electricity efficiency to beam angles and dispersion of the light. E27 LED Lamps of the study can be applied on the sub-indoor illumination.

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