本論文研究立體結構4W LED燈取代40 W裝飾燈光通量300 lm為例，裝飾燈體積屬於小尺寸燈泡，對於光、電、熱的設計難度更高，因此提出立體結構方式，利用負責導電銅片環狀排列方式將熱傳導至外殼導熱塑膠，再由導熱塑膠高熱放射率特性，進行對外部空氣熱交換，達到散熱功效。偋除LED平面擺放方式並以立體架構取代二次光學鏡頭來改變LED燈泡配光曲線，只要調整銅片傾角即可改變光型減少光學損失，過程中利用光學與熱模擬軟體於分析設計，同時改善光、電、熱的需求，最後製作樣品驗證，在輸入4.69W，測得量測點最高溫度77.4 °C，推算出 LED最高接面溫度87.5 °C，光通量402.8 lm、半功率角配光曲線最高270度達到預期效果，可再依此結果修正最佳化的LED燈泡規格。; This thesis is to design the Light Emitting Diode Candle light to replace the 40 W 300 lm incandescent lamp. The LED candle light has a small size which will increase the difficulties in designing for light shape, electricity circuit , and heat sinking. The three-dimensional heat sinking structure is able to transmit the heat effectively from circularly arranged LED chips mounted on copper dissipate to the thermally plastic of the LED's candle light mount, and then dissipate the heat to the external air thermal radiate on from the plastic. The luminous intensity will be reduced by using optical lens for the flat LED arrangement to change the optical distribution curve. The three-dimension structure can avoid this optical loss sample by adjusting the angle of copper mount to change the light distribution. We used optical and thermal simulation softwares to analyze the light distribution and heat dissipation to find a optimal design for need. Finally a sample was made to verify the design. At 4.69W input, the measured highest temperature is 77.4°C. It predicts that LED's the highest junction temperature is 87.5°C with 402.8 lm and the highest half power angle of luminous distribution curve is 270°. It achieved expected result. The LED bulb specification can be further optimized based on our result.