Visual, Biological and Emotional Aspects of Lighting: Recent New Findings and their Meaning for Lighting Practice

Bommel, Wout van

doi:10.1582/leukos.02.01.001

Cited by 19 publications

(14 citation statements)

References 4 publications

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“…In the last decades researches demonstrated that light produce effects not only on the visual system, but also on human physiology and behaviour (see van Bommel 2004 for a review) [5]: these discoveries imposed to define new lighting criteria [6] and the principles of healthy lighting (CIE 158:2004; CIE 218:2016 ) [7], [8] were included in the concept of lighting quality. The luminous environment produces additional effect to vision, depending in particular on the light reaching the eyes: these non-visual effects are related mainly to the light features, such as spectral composition and intensity, and partially also to the environmental features that interact with the luminous beam incident on the eye, like colours and roughness of materials: even if these characteristics of materials are more relevant for the visual system, they can also partially impact on the non-visual process modifying through reflections the spectral composition of the light [9] [10].…”

Section: Introductionmentioning

confidence: 99%

Cold LED lighting affects visual but not acoustic vigilance

Burattini

Piccardi

Curcio

et al. 2019

Building and Environment

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Previous studies demonstrated that both light intensity and spectral composition of light impact on brain functioning and regulate circadian rhythms. Further, several studies have shown that light exposure, especially blue light (about 460 nm), has positive effects on alertness, vigilance, mood, also increasing mental performance and work productivity. Unfortunately, results have not been always consistent. This study investigated the effect of different lighting conditions on attention with an experiment examining the impact of correlated colour temperature (CCT) on visual and acoustic vigilance. The performance of forty participants (20 men), aged from 20 to 35 years, was investigated under warm (3000 K) or cold (6800) white LED lighting conditions: under these conditions they executed a cross-modal vigilance task and filled in the Karolinska Sleepiness Scale (KSS) and the Global Vigor and Affect (GVA) scale. Results showed a positive effect of cold light on visual vigilance and absence of effects on acoustic vigilance. Specifically, a significant effect of the cold lighting condition was found in the visual response times (RT): participants in the experimental group when executing the task with 6800 K LED maintained the same visual vigilance level and did not experience the natural vigilance decrement, as occurred to the control group under 3000 K LED Furthermore, no effects were observed on sleepiness and vigour-mood self-assessments. A hypothesis of the possible reason for this modality-specific effect could rely on different neural bases involved in visual versus auditory signals.

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Section: Introductionmentioning

confidence: 99%

Cold LED lighting affects visual but not acoustic vigilance

Burattini

Piccardi

Curcio

et al. 2019

Building and Environment

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“…Недавні медикобіологічні дослідження показали, що світло крім зорових функцій спричиняє на організм людини незоровий біологічний та психологічний вплив. Це означає, що хороше освітлення позитивно впливає на здоров'я, благополуччя, бадьорість і навіть на якість сну [1,2,3,4,5]. Дослідження впливу освітлення перед сном виявило, що в першій половині періоду сну лампи з підвищеною корельованою колірною температурою (далі -ССТ), знижують глибину сну сильніше ніж лампи з більш низькою ССТ [6].…”

Section: постановка проблемиunclassified

“…Тоді як максимум зорової чутливості для денного зору відповідає жовто-зеленій області спектра, максимум біологічної чутливості припадає на синю область. Такі властивості важливі для створення за рахунок змінення колірності від холоднобілої до тепло-білої біологічно активного або біологічно неактивного (розслаблюючого) освітлення [1]. Рядом досліджень підтверджено що короткохвильове світло в порівнянні з більшими довжинами хвиль ефективніше викликає фазовий зсув циркадної системи та пригнічення секреції мелатоніну, підвищує почуття бадьорості, підвищує частоту серцевих скорочень, температури тіла та експресію генів біологічного годинника [3].…”

Section: аналіз стану проблемиunclassified

“…Враховуючи, що світло для людей є не тільки засобом отримання зорової інформації але й здійснює на них незоровий вплив в ряді наукових праць висловлюється думка, про невідповідність систем світлових вимірювань сучасним реаліям і необхідність розроблення нової системи світлових вимірювань, яка буде враховувати аспекти регулювання циркадної та ендокринної системи, а також нейроповедінкових реакцій, що викликаються впливом світла [1,2,3].…”

Section: аналіз стану проблемиunclassified

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Directions for Improvement of Standards on Led Technique and Lighting With Its Use

Shpak¹,

Martirosova²,

Сахно

et al. 2020

MEC

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One of the main tasks of high-quality lighting is to provide comfortable visual work and adequate perception of illuminated objects by obtaining light with a wide range of correlated color temperatures with high color rendering quality. The paper analyzes the shortcomings of national regulatory documents on establishing tolerances for the color of lamps and fixtures using LEDs and evaluating their quality in color reproduction. Instead of using Mac Adam ellipses on the SIE 1931 (x, y) color chart for establishing the color requirements it is recommended to use circles on the 1976 SIE (u ', v'), and evaluate the color rendering quality using the CRI method, additionally apply the CQS and TM 30-18 methods. Due to the fact that the spatial color of LED luminaires can be inhomogeneous, it is recommended to indicate both the average color and color in a certain direction, as well as an indicator of the color heterogeneity. The necessity of developing standards for protection against unwanted non-visual biological effects, as well as other negative effects of artificial light, in particular, excessive brightness, pulsation of the light flux, photobiological hazards, etc., is substantiated. Considering the importance of the influence of light pulsation on the quality of lighting, before the development of CIE or IEC standards, it is recommended that national standards for LED lamps and luminaires include the requirements for description of pulsation parameters and measurement methods in accordance with the recommendations of IEEE 1789-2015 standard, which is the most advanced today. For the design of ergonomic lighting, it is proposed to provide information on lamps and luminaires related to their maximum brightness. When developing new criteria for lighting, taking into account the visual impact, it is already possible to use the knowledge accumulated by this time, in particular, for creation of biologically active and biologically dimmed light by changing the spectral composition of radiation and illumination. Proposals related to the limits of the correlated colour temperature, brightness, level of pulsation for lighting of children and educational institutions, residential premises and the like are also considered. Recommendations on the development of new national standards of Ukraine harmonized with international ones are also provided. Keywords: сolor rendering index, percent flicker, correlated colour temperature, illumination, photobiological safety

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“…Today, the role played by daylight on the state of mind, on physiology, and on the well-being of human beings seems to be certain, especially after the discoveries presented in [11,12]. These studies [13,14] demonstrate the role of biological lighting, as well as its effects on the circadian system and productivity.…”

Section: Introductionmentioning

confidence: 99%

Modeling of Light Pipes for the Optimal Disposition in Buildings

2019

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A light pipe is an excellent solution to transport and distribute daylight into environments without or with little lighting, guaranteeing comfort inside the rooms. As stated in the literature, the evaluation of the performances of light pipes presents numerous complexities, making the work very difficult for technicians and designers. This study is aimed to present a methodology that is able to identify the potential of light pipes using indices such as daylight autonomy (DA), continuous daylight autonomy (DAc), and useful daylight illuminance (UDI). This paper presents an analysis of daylight obtained by several configurations of simple models of light pipes installed into a 5 × 5 m plant area room. All simulations are carried out in a DAYSIM environment, which allows calculating the annual availability of daylight based on a RADIANCE raytracer backward. Several daylight conditions were analyzed for different light pipe configurations, considering different pipe lengths and a variable number of light pipes. The light pipes are tested also in the horizontal position, for different orientations. The results of all the combinations were compared with the performances of a window with dimensions equal to 1/8 of the internal surface, which was in accordance with the minimum value to be guaranteed by the Italian Regulation (D.M. 5 July 1975 n. 190) for different orientations. The results indicated a difference in daylight distribution, showing a strong correlation between the percentage levels of DA and DAc with the length and number of pipes, during different periods of the year. The simulated model is strongly influenced by the aspect ratio (R = diameter/length). The results show that the illuminance levels decrease drastically, increasing the length.

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Visual, Biological and Emotional Aspects of Lighting: Recent New Findings and their Meaning for Lighting Practice

Abstract: Recent research in photobiology has revealed links between light and human health that are likely to have a significant effect on lighting practice. These effects should begin to be incorporated into lighting design practice and lighting recommendations.

Cited by 19 publications

References 4 publications

Cold LED lighting affects visual but not acoustic vigilance

Cold LED lighting affects visual but not acoustic vigilance

Directions for Improvement of Standards on Led Technique and Lighting With Its Use

Modeling of Light Pipes for the Optimal Disposition in Buildings

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