將光型視為光線的 「交通指揮員」。它控制著燈光從燈具中傳播的位置、程度和模式。這種精確的定向會對空間的氛圍和功能產生重大影響。北美照明工程學會（IESNA）建立了一套廣為接受的光型分類系統，分為 I 至 V 類。
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