ABSTRACT

Spectrally and spatially resolved information on daylight is critically important when planning for non-image forming (NIF) responses. Nevertheless, the availability of such data is scarce given the high initial costs and complex on-site maintenance of high-end spectral measurement devices. The CIE (Commission Internationale de l’Éclairage) reconstruction procedure allows for the derivation of the daylight spectral power distribution (SPD) from the chromaticity coordinates or the correlated color temperature ($T_{cp}$). However, several studies have suggested that both the daylight locus and the reconstruction procedure are erroneous, and specifically SPDs with a higher $T_{cp}$ cannot be reproduced accurately.

This paper studies the reconstruction accuracy of the SPD of daylight, and contextualizes the findings in relation to NIF effects. The analysis comprises a comparative study to determine the accuracy of the CIE procedure compared to two localized reconstruction procedures, and a sensitivity study to examine the impact of accuracy on the assessment of NIF responses, as represented by all five retinal photoreceptors and expressed in the α-opic efficacy of luminous radiation. The results indicated that a localized procedure, adjusting both the daylight locus and the PCA components of daylight, outperformed the CIE reconstruction method. However, improvement in the reconstruction accuracy had no effect on NIF assessment. The RSMPE for α-opic quantities did not exceed 4% for any procedure. In practical terms, this implies that cost-effective sensors and the representation of spectral properties in sky models with a single value – the correlated color temperature – can be used for NIF purposes. These findings bridge theory and practice by opening up new insights into the understanding of simplified methods used to determine NIF effects of daylight.

摘要

在规划非图像形成 (NIF) 响应时，关于日光的光谱和空间分辨信息至关重要。然而，鉴于高端光谱测量设备的高初始成本和复杂的现场维护，此类数据的可用性很少。CIE（Commission Internationale de l'Éclairage）重建程序允许从色度坐标或相关色温（${吨}_{Cp}$). 然而，一些研究表明日光轨迹和重建程序都是错误的，特别是 SPDs 具有更高的${吨}_{Cp}$无法准确再现。

本文研究了日光 SPD 的重建精度，并将与 NIF 效应相关的研究结果背景化。该分析包括一项比较研究，以确定 CIE 程序与两个局部重建程序相比的准确性，以及一项敏感性研究，以检查准确性对 NIF 反应评估的影响，由所有五个视网膜光感受器表示并以 α 表示- 光辐射的视效。结果表明，调整日光轨迹和日光 PCA 分量的局部程序优于 CIE 重建方法。然而，重建精度的提高对 NIF 评估没有影响。对于任何程序，α-opic 量的 RSMPE 均不超过 4%。实际上，这意味着具有成本效益的传感器和天空模型中具有单一值（相关色温）的光谱特性表示可用于 NIF 目的。这些发现通过开辟新的见解来理解用于确定日光 NIF 影响的简化方法，从而将理论与实践联系起来。