Architectural lighting has traditionally addressed visual performance and horizontal illuminance on the work plane, later focussing on energy efficiency, while only recently paying particular regard to human health outcomes. The present study evaluated the effectiveness of several light-emitting diode lighting strategies for delivering circadian stimulus to occupants of a typical office space while minimizing energy use. The study employed photometric simulations in a typical open-office space, delivering a criterion circadian stimulus of 0.3 to calculation points modelled at the simulated occupants’ eye level. Six luminaire types, two luminous intensity distributions, six spectral power distributions and two horizontal illuminances were evaluated, resulting in 144 unique lighting conditions. Additionally, the study calculated the discomfort glare for selected luminaires with the highest total lumen output, smallest aperture and direct-only luminous intensity distributions at the higher of the two horizontal illuminances (500 lx). The most impactful strategy involved supplementing common overhead lighting with a desktop luminaire delivering light directly to the simulated office occupants’ eyes, which provided greater circadian stimulus and used less energy than overhead luminaires that were capable of delivering the criterion circadian stimulus of 0.3.

中文翻译：

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发光二极管照明在办公空间提供昼夜节律刺激同时最大限度地减少能源使用的有效性

传统上，建筑照明解决了工作平面上的视觉性能和水平照度，后来关注能源效率，而最近才特别关注人类健康结果。本研究评估了几种发光二极管照明策略在为典型办公空间的居住者提供昼夜节律刺激同时最大限度地减少能源使用的有效性。该研究在典型的开放式办公空间中采用光度模拟，将 0.3 的标准昼夜节律刺激传递到模拟居住者眼睛水平的计算点。评估了六种灯具类型、两种发光强度分布、六种光谱功率分布和两种水平照度，产生了 144 种独特的照明条件。此外，该研究计算了在两个水平照度 (500 lx) 中较高者的总流明输出最高、孔径最小和仅直接光强分布的选定灯具的不适眩光。最有影响力的策略是用桌面灯具补充普通的头顶照明，将光直接传送到模拟办公室居住者的眼睛，与能够提供 0.3 标准昼夜节律刺激的头顶灯具相比，这提供了更大的昼夜节律刺激并使用更少的能量。