Abstract
This article presents the research on a road lighting design. In this kind of design for a specific type of a roadway, the number and spacing of luminaires are calculated on the basis of luminaire photometric parameters such as intensity curve (LPIC) and luminous flux. The values of these parameters are measured using the luxmeter, i.e., a measuring instrument in which the spectral sensitivity should imitate spectral sensitivity of the human eye V(λ). However, the luxmeter’s spectral sensitivity S(λ) is not perfectly matched with the required one and varies for different instruments, resulting in measurement errors. To avoid this measurement error, the spectral mismatch correction factor (SMCF) should be applied to luxmeter’s readings. For a given luxmeter, the SMCF values depend on the measured light’s spectral composition SPD (described also by the lamp’s correlated color temperature CCT). Unfortunately, many laboratories do not apply SMCF to their luxmeter readings. Typical measurement laboratories are not in possession of SMCF data as this kind of data is hard to obtain and can be provided only by the state-of-the-art photometric laboratories for a high cost. Consequently, these typical measurement laboratories provide inaccurate LPIC data to costumers. In this article, it has been shown that a design process of road lighting installations needs to be based on lighting fixture LPIC’s measurements with SMCF values being taken into account. Omitting this fact may result in road lighting installation made on the basis of a design utilizing incorrect LPIC data, which would have higher energy consumption then expected at a design stage.
Highlights
Modern lighting and lighting of outdoor areas are rapidly growing segments of the lighting market
There has been no research on the study of the influence of failing to use the spectral mismatch correction factor (SMCF) factor in luminaire photometric intensity curve (LPIC) measurements made with class B luxmeters on the results of road lighting designs
A comparative analysis of the results in individual lighting projects with the reference project made it possible to determine the impact of not taking the SMCF factor into account on the results of the design calculations
Summary
Modern lighting and lighting of outdoor areas are rapidly growing segments of the lighting market. When measuring the LED-based road luminaire photometric intensity curve, we are dealing with a source of measurement error not described in the CIE document 121:1996 [35]. It is the error of measurement resulting from the mismatch between the SPDs (Spectral Power Distribution) of the light source being measured and the SPDs of the standard lamp used to calibrate the luxmeter. Quality could influence the results of street lighting design has been published This issue is of a key scientific and practical importance as the design parameters of a given road lighting installation influence the estimated value of electricity consumption, for which minimization is one of the priorities in the operational strategy of the European Union [17]
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