While the primary role of window attachments is often to moderate glare and solar heat gains, they are also able to provide additional daylight to interior spaces. For this purpose, a variety of daylight-redirecting window systems have been developed over the past 150 years. Fixed reflective systems (slats/light shelves) or prismatic systems that rely on total internal reflection work well under specific solar conditions, but generally sacrifice performance over a much wider range of incident solar angles and sky conditions. Dynamic systems - typically reflective slats - are more responsive to sun angles but have not been able to achieve optimal performance for glare and daylight redirection efficiency. A previous investigation into an adjustable, reflective blind concept first conceived of in the late 1970s showed promise but was not reduced to practice due to lack of adequate simulation and analysis tools. In this paper, this concept is further developed and its energy and visual comfort performance evaluated for four mid-latitude, temperate climates using ray-tracing simulation techniques. Results indicate significant potential lighting energy savings when compared with conventional automated reflective blinds (2.1–4.9 kWh/(m²·a), or 14%–42%, depending on climate and orientation) or, especially, manually-operated matte white venetian blinds (1.4–7.9 kWh/(m²·a), or 9%–54%, depending on climate and orientation), while maintaining acceptable or better visual comfort conditions throughout the interior space.

尽管窗户附件的主要作用通常是减轻眩光和增加太阳热量，但它们也能够为室内空间提供更多的日光。为此，在过去的150年中开发了多种日光重定向窗户系统。依靠全内反射的固定反射系统（板条/灯架）或棱镜系统在特定的太阳条件下可以很好地工作，但是通常会在更大范围的入射太阳角和天空条件下牺牲性能。动态系统（通常是反射板）对太阳角度的响应更灵敏，但无法实现眩光和日光重定向效率的最佳性能。之前对可调式，1970年代末期首次提出的反射式盲目概念显示出了希望，但由于缺乏足够的模拟和分析工具而没有付诸实践。在本文中，此概念得到了进一步发展，并使用光线跟踪模拟技术针对四种中纬度和温带气候评估了其能量和视觉舒适性。结果表明，与传统的自动反射百叶窗相比（2.1–4.9 kWh /（m² ·a），或14％–42％，具体取决于气候和方向），或尤其是手动操作的哑光白色百叶帘（1.4–7.9 kWh /（m ² ·a），或9％–54％，具体取决于有关气候和方向的信息），同时在整个室内空间保持可接受的或更好的视觉舒适度。