摘要
室內設計這個行業中使用間接照明的頻率極高，顯見人們對其有明顯偏好。但受限於其遮蔽直接光源並利用牆壁、天花板反射光線的照明形式，使得光源本身的使用效率相較於直接照明偏低，其光分佈的效果，為直接照明的一半，甚至更少。從節能的立場觀之，間接照明卻是種極不環保的手法。然而，由於情境、場合的需求，或者為了避免照明產生的眩光問題，間接照明已是無法被避免的照明形式。所以基於節能減碳之考量，如何提升現有間接照明形式之照明效率即為重要的課題。 本研究以「暗燈槽照明」與「擋板照明」作為研究對象，分別針對光源種類、天花板材料、二次光學元件、光源角度、天花板形式等相關因素加以變換，並利用照明計算軟體DIALux模擬光環境與足尺空間實驗兩者相互搭配，比較各排列組合之數據資料，以提出改善間接照明形式之照明效率的選擇性型式，以驗證其間之相關因素差異。並使用MDPREF進行節能屬性評量，評估並提出兼顧照明效率與節能之間接照明設計原則，作為今後設計之參考。 研究中發現，當FL與LED作為間接照明的光源選擇時，二次光學元件與光源角度因素分別為影響其間接照明之照明效率的主要因素。而兼顧照明效率與節能之「暗燈槽照明」與「擋板照明」的設計原則分別為：1. 需使用LEDT8燈具並將其調整為45度角，以及使用高反射率材質之平面天花板。2. 需使用LEDT8燈具並將其調整為45度角，以及使用高反射率材質之弧形天花板。
並列摘要
Presenting design features via indirect lighting techniques is a common place for interior designers. This may, in a sense, imply user preference toward such a way of lighting ambiance. In another, however, light beams reflected indirectly from the surface materials surrounding light sources are partially absorbed, redirected, or trapped within the cove. As such, lighting aesthetics is achieved at the expense of energy conservation. To ameliorate, there is a need to scrutinize detail designs of indirect lighting in the sense of secondary optical design of various light sources as well as the luminous efficiency. This study takes on the task to elevate luminous efficiency of two typical means adopted in interior design: cove lighting and cornice lighting. The experiment examines the causal effects between such variables as light source, ceiling paint, beam angle, ceiling pattern, and illumination level of task areas. The resultant data are analyzed via MDPREF program of MDS statistical package. Through which, comparative advantage of these variables may be identified. The analyses reveal the significance of two factors, i.e., the luminous efficacy of tubular light sources, such as fluorescent and LED, and their secondary optical design immediately surrounding them. As a result, it is recommended that light tubes are to be installed roughly 450 tilted outward for more light output, and the reflecting surfaces facing the tube are to be molded into concave shape so as to guide the light beams down.