Interactive Lighting System Research Articles

Design of the Museum Interactive Lighting System Based on the Digital Twin Technology

With the improvement of people’s cultural level, more and more museums are being built or renovated. The design of lighting products for museums is a specialized field that requires designers to take into account a variety of factors, such as safety, presentation, and maintainability. As museum lighting systems meet the needs of conservation, visitor experience, and maintenance, the traditional design process is limited by the experience of the designer and the actual situation of the museum, and the actual light conservation effect of the exhibits is difficult to quantify. We have designed a digital-twin-based intelligent lighting system for museums, which can facilitate museum managers to quantify and manage the light life of exhibits while providing a more immersive viewing experience and recognition effect for visitors.

Analyzing occupants' control over lighting systems in office settings using immersive virtual environments

Research has identified occupant behavior as one of the key contributors to building energy performance gap. Thus, this study systematically analyzed the impact of having personal control over lighting system on occupants' lighting choices, lighting satisfaction, and task performance in a virtual office setting. For this purpose, 30 participants took part in a 3-phased experiment with immersive virtual environments (IVEs). Each phase of the experiment offered a different degree of control over the lighting. Personality traits were also studied in relation to lighting choices. Finally, a technology acceptance model (TAM) was employed to further investigate the participants’ attitude towards the virtual reality (VR) technology.The findings of this study showed that using an interactive lighting system, which was as satisfactory compared to a conventional lighting system, encouraged the participants to use more natural light. The interactive lighting system imposed the same amount of cognitive load on the participants for performing a reading task as a conventional lighting system, which was significantly lower than their cognitive load scores for performing the task with automated lighting system. Personality analyses demonstrated that the participants with a high score on openness had a wide range of lighting choices either with conventional or with interactive lighting. This study's results differed from the previous studies by highlighting that the participants considered VR as a better fit to an enjoyable experience rather than a useful tool for performing serious tasks.

Building value proposition for interactive lighting systems in the workplace: Combining energy and occupant perspectives

Today, new lighting technologies are rapidly changing energy savings goals and the ways in which those savings are identified and captured. As occupant expectations concerning indoor comfort and well-being are transforming lighting design and engineering solutions, research concerning systems that afford more interaction between occupants, overhead lighting, and local (task) lighting is prudent. This study builds a value proposition by determining risk-based energy savings potential of interactive lighting system while evaluating programmatic success through the measurement of occupants’ psychosocial variables. Post-retrofit data supplied by an overhead lighting control system were combined with empirical energy consumption data from individual tunable desk lamps for a probabilistic return on investment (ROI) analysis. Descriptive and correlational analyses were done to link employees’ environmental perceptions with energy consumption. Even for a modestly energy efficient office building that underwent a lighting retrofit in 2011, it is possible to recover the cost of an interactive lighting investment in nine years. Probabilistically, the rebate appears to be the most important factor in increasing ROI. Occupants perceived overall improvement to the lighting environment after desk lamps had been installed, and that a ‘blending’ had been achieved between task and overhead lighting. The paper proposes a generalizable mixed-methodology to evaluate potential savings. Interactive lighting systems are representative of future building systems that require more human interaction and are prone to irregular operational loads. This research may help facility managers find practical solutions based on existing and emerging technologies to leverage readily available data to aid decision-making processes.

Interactive emotional lighting system using physiological signals

This paper proposes an emotionally interactive lighting system to support affective experiences while enjoying video content. The emotional lighting system is controlled by changes in an individual?s emotional state. The newly designed system consists of an emotion recognition system that uses three different physiological signals (photoplethysmography, skin temperature, and galvanic skin response), an emotion lighting control system, and an emotion ambient lighting system. The physiological responses of nineteen subjects are evaluated in terms of emotional arousal and relaxation states with two different colors of light. The physiological signals are analyzed in both the time and frequency domain, and test results show that the peak-to-peak interval value and ratio of high to very-low frequencies of the photoplethysmography signals decreases significantly following a red light stimulus when arousing video content is played, whereas the same factors exhibit a significant increase after a blue light stimulus while relaxing video content is watched. These results show that red and blue light is an effective intensifier of emotional arousal and relaxation experiences during displays of arousing and relaxing video content, respectively.

A 3D Lighting System for fMRI Rendering Fidelity Experiments

Although improvements in basic computer graphics rendering hardware and lighting algorithms have produced some remarkable results, it is still computationally demanding to render a highly realistic Virtual Environment (VE) in real-time. This paper presents a real-time synthetic lighting system incorporating sophisticated global illumination algorithms aiming to induce similar subjective lighting impressions as in the real world. The lighting system proposed is designed to render an interactive VE on an fMRI display, enabling the conduct of formal neuroscientific experiments and investigating the effects of visual fidelity as well as varied lighting configurations on feelings of presence, ‘reality’ and comfort. Ultimately, the goal is to use this system to explore the effect of lighting variations (daylight vs. forms of artificial light) on subjective impressions of a group of patients suffering from the ‘depersonalization’ syndrome. The system was developed in close collaboration with the Brighton and Sussex Medical School in the UK. It was a challenge to develop an interactive lighting system to be utilized for fMRI experimentation due to infrastructural and technical demands. Such demands were based on acquiring user input when immersed in the constrained environment of an fMRI scanner while the system reacts to it in real-time. fMRI experiments usually employ simple display material, for example using photographs, video clips or simple computerized stimuli. Employing VEs in fMRI has the advantage that it is possible to involve participants in interactive animated environments which more realistically reflect social and emotional situations.