Analysis of LLL System Properties for Different Excitation Parameters

Photoluminescent strips forming a Low Location Lighting (LLL) system are the primary method for marking escape routes on passenger ships. The LLL system can be built as a self-luminous system (powered by electricity) or made as a series of strips made of photoluminescent materials, which glow and indicate the escape route after the loss of basic and emergency lighting. To ensure correct visual guidance, these strips must be installed at specific locations in the passageways and achieve appropriate photometric parameters after a certain time from their activation. The properties of the LLL system depend on the type of luminescent material used, the excitation source, and the exposure parameters. This paper presents the results of laboratory tests on two types of photoluminescent materials used for the construction of LLL systems. We recorded the change in luminance after the loss of excitation and measured the luminance values obtained 10 and 60 min after the loss of excitation under exposure to light sources commonly used for interior lighting on passenger ships. It turns out that replacing fluorescent lamps with LED lamps can reduce the luminance of the LLL system.

Research on the Effect of Light and Shadow in Computer-aided Interior Design

For interior design students, in addition to learning the principles of interior design, the most important thing they learn is how to better use computer technology to assist their design. For example, AutoCAD drafting trains students to use computer software to draw their own designs according to industry norms; 3DMAX helps students to display their designs with realistic effects; not to mention PS and VRay rendering, which is a great help for lighting. All these situations show that today’s interior lighting design is inseparable from the assistance of computers. Based on this, this paper explores the effects of computer-aided interior design lighting.

Quantifying biologically essential aspects of environmental light

Quantifying and comparing light environments are crucial for interior lighting, architecture and visual ergonomics. Yet, current methods only catch a small subset of the parameters that constitute a light environment, and rarely account for the light that reaches the eye. Here, we describe a new method, the environmental light field (ELF) method, which quantifies all essential features that characterize a light environment, including important aspects that have previously been overlooked. The ELF method uses a calibrated digital image sensor with wide-angle optics to record the radiances that would reach the eyes of people in the environment. As a function of elevation angle, it quantifies the absolute photon flux, its spectral composition in red–green–blue resolution as well as its variation (contrast-span). Together these values provide a complete description of the factors that characterize a light environment. The ELF method thus offers a powerful and convenient tool for the assessment and comparison of light environments. We also present a graphic standard for easy comparison of light environments, and show that different natural and artificial environments have characteristic distributions of light.

Sistema modular de telemetría para medición de parámetros en el hogar, basado en el internet de las cosas

In this article, we discuss the development and results obtained in the design of a modular telemetry system for measurement of different parameters at home and having the possibility of knowing and monitoring the data remotely through a mobile application. Using instrumentation, it is planned to measure electrical energy consumed at home in kWh, the amount of water consumed, pressure and presence of LP gas, interior lighting, temperature and the energy generated by a photovoltaic panel interconnected to the electrical grid. The architecture proposed for the development of this application is based on the three-layer model of the IoT (Internet of Things), making use of a microcontroller based on the ESP8266 chip called NodeMCU®, the reading of the parameters proposed above is performed, and these data are transmitted through a Wi-Fi (Wireless Fidelity) communication protocol called Websockets®, the data is sent to a database on the internet using Firebase® service, later this database communicates with a mobile application in which displays the data collected by the microcontroller in a graphical interface programmed with Android Studio®. The user will be able to monitor the different parameters in real-time and based on his criteria, take preventive and corrective actions for the conscious use of his energy resources.

Ceiling and Wall Illumination, Utilance, and Power in Interior Lighting

The common use of electric lighting in interiors has led to the need to search for user- and environmentally-friendly solutions. In this research, the impact of the luminaires and room parameters on the selected parameters of general lighting in interiors was assessed. To achieve the objective of this work, a computer simulation and statistical analysis of results were conducted. The illuminance uniformity on work plane, ceiling and wall relative illuminances, utilance, and normalized power density of lighting installations for 432 situations were analyzed in detail. The scenarios were varied in terms of room size, reflectance, lighting class, luminaire downward luminous intensity distribution, and layout. The lighting class was a factor having the highest impact on ceiling and wall illumination, utilance, and power. It was also shown that the impact of lighting class on ceiling illumination, utilance and power, was different in interiors of various sizes. The impact of reflectances and luminaire layouts on the analyzed parameters was significantly lower. The results also demonstrated that the use of different lighting classes gave the possibility of reducing the power of general lighting in interiors at a level of 30% on average. Based on the results, a classification of energy efficiency in general lighting in interiors was also proposed. Understanding the correlations between the lighting system used and the effects achieved is helpful in obtaining comfortable and efficient lighting solutions in interiors.