Measurement model of circadian action factor of phosphor-converted white LEDs based on photometric, electrical, and thermal properties

IF 2.1 3区工程技术 Q2 INSTRUMENTS & INSTRUMENTATION

Metrologia Pub Date : 2024-01-17 DOI:10.1088/1681-7575/ad1f80

Xuehua Shen, Huanting Chen, Min Xu, Xiaoxi Ji, Qun Qin

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引用次数: 0

Abstract

Light stimulus is confirmed to have critical non-visual biological effects on human beings, and thus evaluation of lighting quality should not be limited to traditional visual performance. The circadian action factor (CAF) has been put forward to quantify such non-visual effects of light sources. This paper focuses on studying the photometric, electrical, and thermal properties of widely used phosphor-converted white LEDs (PC-WLEDs), and establishes an indirect measurement model of CAF regarding temperature, current and excitation wavelength. During modeling, the spectral power distribution (SPD) of PC-WLEDs is described as an extended Gaussian function of the double-color (blue-yellow) spectrum. In verifications, the remarkable consistency is obtained between indirect measurements and direct calculations, while the maximum relative errors do not exceed 2.6% and the mean relative errors do not exceed 0.9%. The proposed measurement model involves a series of optical tests and calibrations, which are simple for LED system designers to comply with. It offers an effective tool to quantify the PC-WLEDs’ non-visual biological effects on human beings, avoiding costly optical instruments and laborious calculations. Furthermore, it provides a potential theoretical foundation for realizing human-centric assessment, regulation and control of artificial lighting.

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基于光度、电学和热学特性的荧光粉转换白光发光二极管昼夜节律作用因子测量模型

光刺激已被证实对人类具有重要的非视觉生物效应，因此对照明质量的评估不应局限于传统的视觉表现。人们提出了昼夜节律作用因子（CAF）来量化光源的这种非视觉效应。本文重点研究了广泛使用的荧光粉转换白光 LED（PC-WLED）的光度、电学和热学特性，并建立了有关温度、电流和激发波长的 CAF 间接测量模型。在建模过程中，PC-LED 的光谱功率分布 (SPD) 被描述为双色（蓝-黄）光谱的扩展高斯函数。在验证过程中，间接测量和直接计算之间取得了显著的一致性，最大相对误差不超过 2.6%，平均相对误差不超过 0.9%。所提出的测量模型涉及一系列光学测试和校准，对于 LED 系统设计人员来说非常简单。它为量化 PC-WLED 对人体的非视觉生物效应提供了有效工具，避免了昂贵的光学仪器和费力的计算。此外，它还为实现以人为本的人工照明评估、调节和控制提供了潜在的理论基础。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Metrologia 工程技术-物理：应用

CiteScore

2.80

自引率

25.00%

发文量

137

审稿时长

12 months

期刊介绍： Published 6 times per year, Metrologia covers the fundamentals of measurements, particularly those dealing with the seven base units of the International System of Units (metre, kilogram, second, ampere, kelvin, candela, mole) or proposals to replace them. The journal also publishes papers that contribute to the solution of difficult measurement problems and improve the accuracy of derived units and constants that are of fundamental importance to physics. In addition to regular papers, the journal publishes review articles, issues devoted to single topics of timely interest and occasional conference proceedings. Letters to the Editor and Short Communications (generally three pages or less) are also considered.