Measurement and Analysis of Luminance Values and Ratios on a Road with an Adaptive Lighting System

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angličtina

Light has an effect not only on the formation of visual perception itself, but also on other biological functions of humans - especially the endocrine system, which in this case mainly includes the pineal gland and the melatonin it produces. This hormone influences not only sleep and the associated processes of biological renewal, but also the secretion of other hormones and thus the human organism. An inappropriately designed lighting system (both in terms of the intensity of the lighting and the spectral composition of the light emitted) can adversely affect the secretion of this hormone, which can then be reflected in poor quality sleep or depression, or even diabetes or certain types of cancer. Moreover, humans are not the only living beings to be affected by disruptive light (and especially its blue component) - the negative effects of this phenomenon have been demonstrated in a wide range of animals, from insects, fish and amphibians to birds and higher mammals. In addition, ALAN (artificial light at night) also affects plant growth, typically affecting growth changes in deciduous trees, for example. For these and other reasons not mentioned here (mainly excessive energy consumption), so-called adaptive or biodynamic lighting systems, i.e., lighting that typically changes its luminous flux, the spectrum of light emitted, and thus the correlated color temperature, or both, with time, have been gaining prominence, especially in recent years. It is also possible to relate the light output of such a lighting system to the detection of the presence of people in the illuminated space. For example, a reduction of the luminous flux by up to 50 % and a shift of the correlated color temperature from 2700 K to 1800 K are typical. The requirements for road lighting are mainly dealt with in the standard ČSN EN 13201. The purpose of the measurements was mainly to compare the individual phases of adaptive (or biodynamic) lighting with each other and with a lighting system based on high pressure sodium lamps (HPS) and LEDs, in terms of luminance distribution and its uniformity on the road surface in the sense of ČSN EN 13201. The measurements were carried out on a less busy two-lane roads, probably class M4, and a luminance analyzer was used. This was followed by the evaluation of the luminance maps and the determination of the luminance values and their uniformities and finally the comparison itself.

luminance; luminance camera; luminance analyzer; ALAN; stray light; obtrusive light; skyglow; biodynamic lighting; adaptive lighting; LED; streetlight

NOVÁK, F.; BAXANT, P.; MOTYČKA, M.

20. 9. 2022

Česká společnost pro osvětlování, z.s.

17. listopadu 2172/15, 708 00 Ostrava – Poruba, Czech Republic

978-80-11-02269-3

PROCEEDINGS of the 14th European Lighting Conference LUX EUROPA 2022

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