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This study deals with the health and wellbeing of humans who work in offices as well as the energy use for the lighting. The focus is on how integrative lighting and daylight harvesting can be combined in an attempt to reduce the energy consumption while still eliciting a circadian response for the workers. The aim of this study is to investigate a combination of integrative lighting and daylight harvesting. Besides that, the study partly aims to make a literature review on the topic with the intention to find answers for unanswered questions for previous studies. The goal on the other hand is to understand how an integrative lighting system in offices could be engineered to consume less energy that it does today, while still eliciting similar variations of melanopic over photopic (M/P) illuminance ratios. The research methods of this report included primary research of on-site measurements and observations as well as research of literature studies. Moreover, several modelling and simulation software’s within energy and non-visual effects of light were used and analysed in order to answer the research questions. Literature on the subject along with technical information for the chosen light source has been a central and important part of the study, Adaptive Lighting for Alertness (ALFA) was a key factor in order to achieve optimum results. The results correlate with literature and previous research as they both confirm that the circadian entrainment is affected differently by different SPDs. The study shows that a combination of integrative lighting and daylight harvesting reduces the energy consumption, while the M/P ratios were both sufficient and insufficient depending on whether it is wintertime with overcast sky or summertime with clear sky., In modern societies, people tend to spend up 90% of their lifetime indoors of which a big share is spent at work, this raises the demands for several aspects in terms of health and wellbeing. Several studies have proved that the quality of lighting has an impact on workers’ health and performance. There is a network of circadian clocks in mammals that are reset with help of input and circadian signals that are delivered to the brain, a master clock at the top of this network that is located in the suprachiasmatic nuclei (SCN) is mainly controlled by ambient light. Intrinsically photosensitive retinal ganglion cells (ipRGC), which works as environmental irradiance detectors which senses light levels independently without the input from either rods or cones, is a proof of the non-visual pathway that affects the human physiology and psychology. The ipRGCs are responsible for transforming the information to the SCN which is located in the brain in order to help reset the circadian clocks. A relatively new concept called integrative lighting is investigated in this study, the concept of integrative lighting is to support the circadian entrainment by varying in intensity and correlated colour temperature (CCT) during the course of a day in order to elicit a circadian response. Most of the integrative lighting systems that are available today are designed with the intention of supporting the circadian entrainment, which has led to lost or less focus on the energy consumption of such light source despite the fact that daylighting is free, and it stimulates the circadian entrainment better than any light source that are available today. Therefore, this study aims to investigate a combination of integrative lighting with daylight harvesting. Earlier studies have shown that integrative lighting stimulates circadian entrainment. But since there were no studies that included the energy use, the objective of this study was to understand how integrative lighting systems in offices

The retail sector represents 11% of the GDP and employs 15% of the workforce in the European Union. To tackle growth of e-commerce, physical retail stores need to be reviewed; both to decrease operating costs, increase productivity and to make the shopping experience more appealing. Energy use for lighting accounts for 50% of the total energy use in non-food retail stores, which is consumed primarily during daylight hours. Therefore, designing for daylighting and electric lighting integration is fundamental to obtain energy savings, as well as keeping occupants healthy and satisfied. This thesis describes field monitoring and supplementary building performance simulations of an existing daylighting and electric lighting integrated design for a furniture store. The store includes several areas of the showroom equipped with abundant daylighting. For the monitoring, the areas of the Living Room and Home Decoration exhibitions were selected. They include wide glazed areas, daylight harvesting systems, and tunable lighting. The monitoring procedure assesses four aspects: energy use, objective or measurable lighting conditions, circadian potential, and subjective evaluation of lighting. This study introduces an assessment based on the customers' path, which proved particularly informative in a retail setting. The results suggest that the integration project was successful in terms of energy saving, as well as customers and staff appreciation. Observations allowed a critical view on some of the objective photometric measures. Surprisingly, limited glare which simulations showed to occur, seems not to be a problem for users, rather an opportunity in a retail scenario. The customers were more attentive to daylighting and observing objects under natural light, and having a (good) view to the outside was the most positively evaluated. Clients also reported a better shopping experience compared to equivalent shops. Staff members showed satisfaction with the electric lighting so, The retail sector is an important part of the global economy and is a major influence on our leisure time and quality of life. With the massive introduction of online commerce, many physical stores have seen their sales drop dramatically. The big retail chains are faced with large stores that do not invoice as much as they used to. In an effort to attract customers again, big retail players are exploring new ways to make their stores more attractive and enjoyable for customers and employees, as well as more sustainable. Daylight and natural ventilation were widely used in old industrial and commercial buildings, but with the cheapening of electric light and air conditioning systems, retail stores evolved into closed boxes. Now we realise the mistake of abandoning natural light, as science proves that it improves not only lighting conditions but also mood, health and can even reduce energy use. Daylight, therefore, is a great tool to improve the shopping and work experience in a store, and that is why in new stores or renovations, the integration of daylight in the design is, luckily, being reconsidered. In this thesis, a peculiar case study is presented; a pilot IKEA furniture store opened in Kaarst (Germany) in 2018 with the aim of testing daylight integrated design as a new strategy for the new chain store openings and retrofits. The solutions include skylights, wide windows and electric lighting that adjusts its intensity and colour with natural light. The results of the case study revealed that customers enjoyed the shopping experience much more compared with other chain stores, especially appreciating the fact that they could observe the products under natural light and have views of the outside. The latter was also highly valued by the employees, as the visual connection to the surroundings made working hours more pleasant. In fact, the integration of daylight was listed by all workers as the most positive improvement of the shop compared to the old one. Other