A.L.P. Rosemann

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• Prof. Dr.-Ing. habil.
• Full professor and chairholder Building Lighting at Eindhoven University of Technology

Lighting Technology offers a comprehensive and complete overview on the field It is based on a well-established German educational book on illuminating engineering, introducing the fundamentals of lighting technology and discussing concepts for good lighting and daylighting design. This book is widely used in German universities and has already hel...

Presently, luminance distribution measurement devices, using High Dynamic Range technology, are increasingly used as they provide a lot of relevant data related to the lit environment at once. However, the accuracy of these devices can be a concern. It is expected that the accuracy would be improved by incorporating the effect of the camera spectra...

Light is one of the important aspects for a comfortable office environment. Too often high quality lighting is not achieved. Lighting quality can be defined by different aspects that are relevant such as the quantity, distribution, glare, spectral power distribution, daylight, directionality, and dynamics of light. The luminance distribution seems...

Dynamic lighting is one of the new trends in lighting research; providing the right lighting level at the right time could possibly increase the alertness and performance of office workers. However, they might have preferences that deviate from this “healthy” lighting. Simultaneously, the building environment becomes increasingly automated, with oc...

In in-patient care facilities, 1 in 5 medication doses is administered incorrectly. A hospital environment which supports the performance of the health-care staff will positively impact patient safety. Objectives Determine which lighting leads to the least reading mistakes of medication labels. Design Experimental study with repeated measures. S...

Visual and thermal comfort for occupants significantly depend on exterior environmental climatic conditions, which are continuously changing. In particular, optimizing visual and thermal comfort simultaneously is a difficult topic due to mutual conflicts between them. This literature review article studies the façade, as a complex interface between...

Highly granular lighting control involves switching on and off luminaires based on individual occupancy. The resulting high frequency of lighting changes can distract the office workers and negatively impact their work performance. In a cubicle office, this might be less of an issue than in an office without partitions, as users do not have an over...

Research demonstrated a large variety regarding effects of light (e.g. health, performance, or comfort effects). Since human health is related to each individual separately, the lighting conditions around these individuals should be analysed individually as well. This paper provides, based on a literature study, an overview identifying the currentl...

Providing environmental control to users in multi-user offices has long being considered not done. One of the reasons is it was believed that personal control in an open office would rather create conflict among office users than bring benefits. However, a number of experimental studies conducted to explore the experience of personal control of lig...

Personal control for office workstation specific lighting was studied already for several decades, whereas this form of lighting control for multi-user offices is a relatively young field of research. The proliferation of open offices in the last decade makes it vital to understand the benefits and drawbacks of personal lighting control in multi-us...

There are several alternatives to passive strategies in the early stages of the design process including orientation, window to wall ratio, shading device, material and colour that affect occupants’ visual comfort. However, applying simple traditional principles such as using colorful glasses for windows are effective in the optimizing of visual co...

Das Buch erläutert praxisnah die physikalischen, energetischen, meteorologischen und lichttechnischen Grundlagen der Solarstrahlung und des Tageslichts. Es ist Grundlage für die Bestimmung effektiver Wirkungen der Solarstrahlung in Gebäudetechnik und Gesundheit. Der Solarstrahlung kommt für das Leben auf der Erde die größte Bedeutung zu. Dieses Th...

Advanced glazing systems with special spectral characteristics or light redirecting behavior are commonly applied to improve building energy efficiency and indoor comfort conditions. The angle-dependent optical properties of such advanced windows can be markedly different from those of ordinary glass. To achieve accurate building performance predic...

Die Absorption spektraler Anteile der Solarstrahlung in der Atmosphäre und auf der Erdoberfläche prägen entscheidend die Umwelt und unsere Lebensbedingungen. Die große Bedeutung der ultravioletten Strahlung ist Gegenstand dieses Kapitels.

Der konstante Strahlungseinfall der Solarstrahlung wird noch lange erhalten bleiben. Die Bedeutung und die Auswirkung auf zukünftige Themen der Solarstrahlungsnutzung werden sich auf die Themen Energie, Einfluss auf Mensch, Tier und Pflanzen sowie auf di Bedeutung für die Industrie beziehen. Diese werden in diesem Kapitel aufgezeigt und interpretie...

Ziel der Tageslichttechnik ist es, das natürliche Licht für die Innenraumbeleuchtung zu nutzen und somit den erforderlichen Kunstlichteinsatz zu verringern. Die Nutzung des Tageslichts erfordert zum einen Tageslichtsysteme und erfordert zur Verbesserung der Energiebilanz für die Beleuchtung von Gebäuden zunächst eine detaillierte Kenntnis der Tages...

Ein großer Teil der Solarstrahlung wird auf dem Weg zur Erdoberfläche durch die Erdatmosphäre auf Grund von Absorptionen oder Streuvorgängen geschwächt. Der Aufbau der Atmosphäre und ihr Einfluss auf die Solarstrahlung werden aufgezeigt und erläutert.

Die Bestimmung von Strahlungs‐, Licht‐ und Farbgrößen der Innenraumbeleuchtung mit Tageslicht setzt die Kenntnis von lichttechnischen Grundlagen und von Parametern voraus, die die Solarstrahlung und das Tageslicht beschreiben. Die Grundlagen der Lichttechnik werden hier nur in kurzer Form zusammenhängend dargestellt.

Die Bewertung von Tageslichtsystemen bezüglich der visuellen und thermischen Eigenschaften setzt die Kenntnis der strahlungsphysikalischen, lichttechnischen und farbmetrischen Eigenschaften voraus. Diese Größen bestimmen die Tageslichtsysteme, die in der Gebäudefassade eingebaut werden, in starkem Maße. Die spektralen Kennzahlen – Basisgrößen der o...

Die Wirkungen der UV‐Strahlung auf den Menschen werden durch die Absorptionseigenschaften der Organe Auge, Haut und Gewebe bestimmt. Hierfür sind quantitative Aussagen unverzichtbar.

Die Potentiale der Tageslichttechnik im Zusammenspiel mit Gebäudemanagementsystemen bei integrierter Planung werden aufgeführt und erläutert. Die Systeme werden klassifiziert und ihre Wirkungsweisen für verschiedene Gebäudetypen erläutert.

Bei der Messung optischer Strahlung ist man hauptsächlich an der Bestimmung der Strahlungsleistung interessiert. Die Methoden zur Messung von Solarstrahlung unterscheiden sich entsprechend den Strahlungsgrößen und Eigenschaften der Strahlung. Die wellenlängenabhängige Strahlungsbewertung ist unverzichtbar.

Für Prüfzwecke wird häufig die natürliche Solarstrahlung simuliert, da die durch die Sonne erzeugte spektrale Bestrahlungsstärke großen Schwankungen unterliegt und deshalb als Testquelle nur sehr eingeschränkt eingesetzt werden kann. Deshalb besteht Interesse, sowohl die direkte und die diffuse Solarstrahlung als auch das Tageslicht mit ihren räuml...

In diesem Kapitel wird auf die Gebäudeautomatisierung mit speziellem Hinblick auf die Beleuchtungstechnik, d. h. auf die tageslichtabhängige Kunstlichtkontrolle i. S. v. Steuer‐ und Regelungssystemen eingegangen. Die Zielsetzung „Steigerung der Energieeffizienz“ gab und gibt Impulse für die Weiterentwicklung der Lampentechnologien, für die Tageslic...

Es werden einige Daten und Annahmen zur Sonne und zur Strahlungsemission gegeben und deren Hintergründe erläutert.

Light directionality, spectrum and relevant radiometric or photometric quantity are believed to be essential factors influencing the magnitude of non-image-forming effects. In this paper, a measurement method and an instrument (the multidirectional spectroradiometer - MuS) is proposed, which considers different light incidents and spectra simultane...

The current field study investigated the ambiguities regarding the relationship between office lighting and subjective alertness. In laboratory studies, light-induced effects were demonstrated. Field studies are essential to prove the validity of these results and the potential recommendations for lighting in future buildings. Therefore, lighting m...

Highly granular lighting control reduces the energy consumption of shared office spaces by automatically controlling lighting at unoccupied desks. Typically, lighting is switched off, but this approach results in non-uniform illuminance distributions. In offices where individual work areas are often not separated by partitions and occupants oversee...

Sports facilities all over the world apply LED lighting. The combination of high luminance and small luminous surfaces causes a high probability of glare and LED lighting contains these specifications. There are specific situations for which validated glare models exist, such as offices or outdoor soccer fields, although indoor sports facilities ar...

Sensor-triggered control strategies can limit the energy consumption of lighting by considering the presence of users in the office and dimming lighting down when it is not needed. In multi-user offices, the application of occupancy-based dimming at room level limits the energy saving potential. However, zone- or desk-based dimming may affect the c...

Background: For treating affective disorders like SAD, light therapy is used although the underlying mechanism explaining this success remains unclear. To accelerate the research on defining the light characteristics responsible for inducing a specific effect a uniform manner for specifying the irradiance at the eye should be defined. This allows...

This paper aims to provide an overview of various aspects used to measure the overall lighting quality, instead of solely focusing on a single aspect. Lighting quality is a concept that allows excellent vision while providing high comfort. However, it cannot be measured directly; although, it can be indicated by measuring different aspects of light...

Health symptoms may be influenced, supported, or even controlled via a lighting control system which includes personal lighting conditions and personal factors (health characteristics). In order to be effective, this lighting control system requires both continuous information on the lighting and health conditions at the individual level. A new pra...

Occupancy-based lighting control strategies have been proven to be effective in diminishing offices’ energy consumption. These strategies have typically worked by controlling lighting at the room level but, recently, lighting systems have begun to be equipped with sensors on a more fine-grained level, enabling lighting control at the desk level. Fo...

In this study, the colour quality of the daylight transmitted through different window glazing types is evaluated. The analysis considered four different types of window glazing: laminated, monolithic, coated and applied film glazing ranging in luminous transmittance from around 0.97 to <0.1. The spectral transmittance data of different window glaz...

Purpose The International Commission on Illumination (CIE) recommends researchers to investigate a wide variety of behavioural and health outcomes. However, researchers often investigate only a part of occupational health (OH) in relation to light. A literature study (2002–2017) regarding the relationship between office lighting conditions and OH w...

A functional prototype of a luminescent solar concentrator photovoltaic (LSC PV) module, called Leaf Roof, aims at demonstrating the design features of LSC PV technologies such as coloring, transparency, and flexibility in physical shape. In this paper, the prototype is presented and the first measurements of its performance are shown. The geometri...

Light beneficially influences human health directly, but moreover, indirectly via occupant's satisfaction with lighting. This study identified parameters influencing occupant's satisfaction with lighting. During a five-day study, 46 office workers evaluated their office lighting conditions once a day using the Office Lighting Survey. The significan...

The quick development of the LED has changed the overall field of lighting technology triggering the need for updating all sorts of documents and literature in the field of lighting. The German lighting association LiTG has initiated a project to work on a new, completely revised version of the book "Beleuchtungstechnik" by Roland Baer. This new 4t...

Various applications in building lighting such as automated daylight systems, dynamic lighting control systems, lighting simulations, and glare analyzes can be optimized using information on the actual luminance distributions of the surroundings. Currently, commercially available luminance distribution measurement devices are often not suitable for...

The benefits of light in offices beyond enabling visual tasks have been demonstrated in former studies. Light positively influences outcome measures such as human's health, wellbeing, visual comfort, motivation, and environmental satisfaction. In order to measure the effects of light on the individual outcome measures, it is of high importance to c...

Occupancy-based lighting control can be applied at several resolution levels. To aid lighting designers in choosing the appropriate solution for a specific open-plan office case, this paper presents a simulation tool which enables calculating the lighting energy use for the different control strategies. By using a stochastic modelling approach and...

Offices are transforming into multi-user, open space environments to stimulate interaction between people and optimize the usage of space. Due to design practices, lighting systems in these multi-user environments are implemented as a regular grid of luminaires that often does not match the furniture layout. Consequently, purely personal control ov...

A round table discussion on Ergonomics and Design for All took place during an international meeting on ergonomics organized by the Dutch organization “Human Factors vereniging” in Amersfoort, NL in November 2016. This event was co-hosted by FEES-Federation of European Ergonomics Societies and CREE-Centre for Registration of European Ergonomists. T...

Literature suggests an influence of the luminance from non-horizontal surfaces in our visual field on our visual and psychological assessments of an office space. These assessments are believed to directly relate to our expressed preferred task illuminances. This paper describes an evaluation in a mock-up office, wherein wall conditions with a non-...

When determining the effects of light on human beings, it is essential to correctly measure the effects, and to correctly measure the adequate properties of light. Therefore, it is important to know what is being measured and know the quality of the measurement devices. This paper describes simple methods for identifying three quality indices; the...

Lighting accounts for a significant amount of electrical energy consumption in office buildings, up to 45% of the total consumed. This energy consumption can be reduced by as much as 60% through an occupant-dependent lighting control strategy. With particular focus on open-plan offices, where the application of this strategy is more challenging to...

aims at meeting human vision and health requirements. Intrinsically Photosensitive Retinal Ganglion Cells (ipRGCs) appear to play an essential role in stimulation of the non-image forming effects and thus human health and well-being. There are indications that radiation incident contributes to the magnitude of these effects. This review summarizes...

Background: The non-image-forming effects of luminous radiation on people with intellectual disabilities or dementia received attention from researchers. Such studies, however, have generally been conducted using disparate methodologies which precludes generalization and reproducibility. Objective: The aim of this study was to determine the prac...

Controlling lighting conditions at desk level has proven its energy savings potential. However , in open-plan offices without partitions separating desks this local control might come at expense of users' comfort. An explorative study in an office building in the Netherlands revealed the influence of local control on users' satisfaction with the li...

Sports fields all over the world have to fulfil certain requirements defined for light conditions. Especially for the football industry these rules are very strict. Daylight has never been studied for meeting those requirements, although it has the possibility to reduce energy costs and increase visual comfort. This study investigated potential day...

(Day)light in office buildings has already been proven to be a beneficial contributor to health. However, people’s perception of the physical light environment deviates significantly from objective measurements. Large differences between user’s perception and objective light parameters, such as illuminance level or daylight contribution, could lead...

Lighting tends to form a large part of the energy consumption in office buildings, which can be influenced by the use of sensors. Several sensor technologies have been developed throughout the years, like for example passive infrared systems. These are however limited in providing an understanding of occupants' behaviour as they often only measure...

Durch die rasante Entwicklung der LED hat sich die Lichttechnik in den letzten zehn Jahren maßgeblich verändert, so dass auch aus diesem Grund ein neues Lehrbuch dringend erforderlich war. Aus dem Inhalt: Lichttechnische und optische Grundlagen Grundlagen der Farbmetrik . Physiologische und psychologische Grundlagen Lichttechnische Berechnungen L...

This paper presents a theoretical framework for incorporating the non-image-forming effects of light into daylighting design in the built environment. The framework includes human performance indicators to measure the magnitude of the non-image-forming effects of light as well as light factors to quantify these effects. In addition, architectural (...

Daylight is dynamic and rich in the blue part of the spectrum. To date, the spectral composition of daylight is ignored in sky models used in Radiance. Spectral sky composition is particularly important when non-image-forming (NIF) light effects are concerned, since the action spectrum for these effects differs from that of the image-forming (IF) e...

Workplace innovation has been changing the European office landscape into mostly open spaces, where enhanced interaction between people is combined by efficient use of space. However, challenges are found in offering individual preferred conditions in these multi-user spaces, especially when dealing with shared systems. Previous studies clearly sho...

Workplaces are transforming from office rooms to office landscapes. Previous research about indoor environmental (IE) aspects and health, investigated work-related health issues mostly in conventional office spaces. It is still uncertain which physical aspects in office landscapes might influence employees’ health the most. An exploratory study, in...

The Leaf Roof project on the design features of PV roof tiles using Luminescent Solar Concentrator (LSC) technology [1] has resulted in a functional prototype . The results are presented in the context of industrial product design with a focus on the aesthetic aspects of LSCs [2]. This paper outlines the design of Leaf Roof tiles under consideratio...

Technology tends to standardize architecture, striving to make it uniform and resulting in a globalization of the architectural thought. The trend of contemporary architecture is not characterized by adapting to the urban or natural context. As such, new buildings are frequently put in opposition to their urban and natural context, which is often c...

Buildings have in recent years been the target of a number of energy efficiency improvement strategies given that they are a major energy end-use sector in most countries. Whilst new buildings due to legislations, increasingly address sustainability and improved energy efficiency considerations, the refurbishment process of older buildings still pr...

Two recently started research projects in the research line of “Creating Healthy Environments” will be described. They focus on improving comfort, health and safety using smart and innovative designs and solutions for the built environment in hospital and office environments respectively. Solutions for healthy environments will not result from opti...

Light entering the human eye does not only enable the performance of visual tasks, but also influences the health and well-being of humans via non-visual effects. A substantial amount of people in the Western society spends the majority of their work time indoors. Well-designed lighting positively impacts the visual comfort and well-being of people...

The challenge of the future is to minimize the energy consumption of buildings while maintaining an optimal comfort level in the interior. Controlling the energy streams in and out of the building , and especially daylight management, plays an important role. It deals with many, sometimes conflicting functions of the building: Generally a maximum...

Conventional solar energy collection technologies have a lot of limitations with respect to their applicability in the urban environment. The PV cells of the buildings need to be oriented towards the South at a specific angle causing restrictions on urban planning. Moreover, the aesthetics of PV cells are not well suited for building design, creati...

The challenge of the future is to minimize the energy consumption of buildings while maintaining an optimal comfort level in the interior. Controlling the energy streams in and out of the building , and especially daylight management, plays an important role. It deals with many, sometimes conflicting functions of the building: Generally a maximum...

Conventional solar energy collection technologies have a lot of limitations with respect to their applicability in the urban environment. The PV cells of the buildings need to be oriented towards the South at a specific angle causing restrictions on urban planning. Moreover, the aesthetics of PV cells are not well suited for building design, creati...

Knowledge about daylight dynamics will enable greater daylight utilisation in buildings. As a consequence, these dynamics need to be considered in daylight design. Time–frequency analyses were performed on daylight data in order to study frequencies in daylight amount. Each of the data sets was attributed to one of five sky condition classes based...

Inaugural Lecture: While the 20th century was dominated by the electron, the 21st century is seen as the century of the photon. The links between lighting technology, optical technologies, information technologies and electronics are still valid today and certainly also apply to building lighting. The European Union has identified societal challeng...

The Energy Efficient Facade Lighting project set out to proof that a conventional optical fibre lighting system for highlighting the structure of a façade can be operated more energy-efficiently through the substitution of the projector using a metal halide reflector lamp by a laser. This concept is investigated by looking into the photometric asse...

The 'LIGHTVAN' research aims to optimize the lighting design for healthy schools and modern senior housing and care homes with regards to the use of light as a cheap and important source of energy. A multi-functional mobile light laboratory was built into a delivery van, the LIGHTVAN. This LIGHTVAN has two clear aims: With this mobile light labora...

The 'LIGHTVAN' research aims to optimize the lighting design for healthy schools and modern senior housing and care homes with regards to the use of light as a cheap and important source of energy.A multi-functional mobile light laboratory was built into a delivery van, the LIGHTVAN. This LIGHTVAN has two clear aims: With this mobile light laborato...

The project set out to proof that a conventional optical fibre lighting system for highlighting the structure of a façade can be operated more energy-efficiently through the substitution of the projector using a metal halide reflector lamp by a laser. This is investigated by looking into the photometric assessment of such systems as well as the ele...

Benchmarking of energy performance plays a key role in advancing energy efficiency through enabling a useful comparison of relative performance and the identification of energy savings potential. Benchmarking tools employing mathematical models of energy use in the industrial sector have lagged behind those used in the commercial and institutional...

The intent of lighting design is to meet the requirements of illuminating a space appropriately. The required characteristics depend on many different aspects consisting of but not limited to: enabling the visual task to be performed in that space by adequately meeting technical characteristics such as illuminance levels, glare ratings and colour r...

Aqui se descrevem dois sistemas de controle sem fio, desenvolvidos em um projeto de pesquisa, para iferentes cenários: desde um campo de futebol ao ar livre até tipos distintos de salas em edifícios de escritórios, o que permitiu estudar diversas estratégias de controle. Os dados coletados antes e após a instalação permitiram avaliar o desempenho d...

The awareness of limited resources as well as the increasing political interest in energy-efficiency demand models for estimating the energy consumption of systems. Worldwide activities look at the energy consumption of various economical sectors including buildings. This paper outlines an approach for estimating the energy consumption for lighting...

Hard wired lighting control systems include occupancy sensing, individual control and daylight-dependent control configured in either open-loop or closed-loop setups. Emerging wireless controls offer similar features and could tap into existing wireless communication networks. Therefore, they have the potential of being implemented in a more cost-e...

The design of a wireless lighting control system comes with various additional challenges over a standard wired control system. Among these there are power supplies, reliability and commissioning issues. Within a pilot project carried out by BC Hydro, wireless lighting controls designed for a number of different scenarios controlled the lighting sy...

This paper proposes a methodology to benchmark lighting energy consumption for new building design or new lighting systems in existing buildings. The influences of electric lighting, daylighting and the lighting control system are evaluated for every building zone. This methodology uses the installed lighting power density, the area of the daylit a...

Die Thematik Beleuchtung hat nicht zuletzt durch die weltweiten Bestrebungen zu energieeffizientem Leben einen hohen Stellenwert in der Forschungslandschaft erhalten. Vorgaben, den Energiebedarf fuer Gebaeude zu senken, erfordern ein grosses Engagement im Forschungs- und Entwicklungssektor der Bereiche Kunstlicht, besonders aber beim Tageslicht. Di...

This paper describes a novel and cost-effective way of providing direct sunlight to the core areas of a multi-storey building. In this system, sunlight is collected by a structure, called the solar canopy illumination system, which attaches to the building directly above the windows on each floor. The sunlight is then redirected by the optical comp...

We have developed a system that enables both daylight and electric light to be efficiently delivered to core areas of a building. Daylight is directed into the building by means of a new and cost-effective canopy system which collects sunlight and directs it into the dual-function luminaire. It efficiently transports and distributes the light along...

As a component of our cost-effective core daylighting research program, we have developed a hollow light guide that can be used to distribute sunlight collected by a heliostat device, and can also operate as an efficient fluorescent light fixture when the sunlight is insufficient to illuminate the workspace. This dual-function prism light guide str...

We have devised a system for piping sunlight deep into buildings, in order to reduce electrical energy use in the workplace. This system is designed to be used, without customization, in the most common workplace environment - substantially open-plan, multi-storey office buildings. The system will provide excellent lighting at all times, and will s...