Determination of the surface temperature and emissivity of glossy materials is a complicated task due to the relatively wide range of emissivity values and the reflection of infrared radiation from surrounding objects. As a consequence, standard methods used in infrared thermography are not applicable. In this article, an alternative method is proposed for the measurement of the surface temperature and emissivity of glossy materials used in the external structures of buildings that is based on an external source of thermal radiation. It is shown that the method gives quite accurate values of emissivity of both low- and high-emissivity glossy materials, whereas the surface temperature of low-emissivity glossy materials is less accurate and strongly depends on the accuracy of the used thermal camera.

The article describes verifying of behaviour of dimming in a regulated lighting system in Smart Home (SH) which was controlled to the constant level of illuminance. The proposed method of measuring was realized as an upgrade for evaluation of curves of interior illuminance caused by daylight. A reference room in SH with a measuring device evaluating illuminance in the places of visual tasks and at the same time scanning illuminance caused by daylight on an outdoor unshadowed horizontal plane was used for measuring. The used measuring device was supplied with a dimmable lighting system of artificial lighting using luminance controller situated on the ceiling of the room in combination with controlling system KNX to reach the constant level of illuminance regarding the influence of both elements of artificial light and daylight. The article shows that there might be difference between the set value of illuminance, which is regulated by a KNX system, and real illuminance in the place of a visual task. Due to this difference, the lighting system may not meet the normative requirements, which is absolutely inacceptable.

This article deals with options for how to express the luminous flux from outdoor electrical substations of the electric transmission system. Processing of the models of light emissions before and after refurbishment of lighting systems was motivated by setting out rules for the design and erection of refurbished lighting systems in outdoor electrical substations, which are most commonly built in inhabited rural areas with low luminance of the background. The proposed model and calculations are based on requirements of international standards and recommendations for lighting of outdoor workplaces as well as on internal regulations of the ČEPS (Czech Transmission System Operator). These requirements are implemented in real electrical substations and lighting models that are extended by the calculation space of the software goniophotometer. The software goniophotometer was used to evaluate light distribution characteristics of entire electric stations in various situations. This article assesses the impact of different lighting systems installed at electrical substations from the perspective of both direct and total luminous flux directed to the upper hemisphere. It takes into account three outdoor electrical substations (420 kV) of a transmission network and their lighting systems before and after refurbishment. The aim of this article is to determine to what extent the electrical substations contribute to emissions of luminous flux to the upper hemisphere. Results from calculations on models show reduced radiation to the upper hemisphere up to 52.3% after refurbishment of obsolete lighting systems, although total installed flux actually increased due to a change in the ratio of direct and reflected luminous flux after refurbishment of lighting systems.