Dionyz Gasparovsky

A new methodology for failure identifying in public lighting network by smart metering

The aim of this paper is describe the application of smart metering technologies in public lighting networks in order to reduce the cost associated with operation and maintenance. Smart metering technology is rapidly developing technology now. In some countries are applications of smart metering already. In Slovakia smart metering is prepared to operation. In paper are described examples of smart metering technology in context of public lighting operation. For specific examples are described methodology of faults identifying by smart metering. The proposed methodology creates a new path in operation of public lighting networks.

Automated system of the measurement of electric parameters of luminaires and light sources at chosen operational conditions

Quality of electric power is influenced all supplied devices. Due to changes supply voltage are electric parameters what can influence their other features. Therefore for example luminaires are measured at different supply voltage to find out impact of supply voltage to the luminous flux. This paper concerns system of analysis at change of supply voltage on photometric parameters of luminaires. Designed system is appropriate for measurement of electric parameters of luminaires because for them description their behaviour at various level of supply voltage is complicated.

LED retrofits and their role in transient to the more energy efficient home lighting

This paper aims to show that retrofit lamps are not always suitable to replace old-fashioned lamp types by simple comparison of their luminous flux. Using a common type of diffuser combined with a clear bulb, retroft compact fluorescent lamp and a LED retrofit the luminous intensity distribution of these combinations have been measured. The results were expected to show significant differences in the resulting lighting parameters. Proof of the expectations and consequences for the application of retrofits are presented in the paper.

Proposal of a method for assessment of energy performance of home lighting

This paper aims to present the proposal of a new method for assessment of lighting energy performance of home lighting, based upon findings and conclusions of research results. As the standard on energy performance of lighting in buildings distinguishes i.e. quick (or simplified) method and comprehensive method, to be used for different purposes, the proposed method is intended to fill the gap in assessment of energy performance of lighting in residential buildings by the comprehensive method. Though still simplified in comparison to other building categories, for home lighting the method differs in principle, formulae to calculate the indicator LENI and uses a number of new specific factors to express the efficiency of major light sources and to take into account the character of different rooms at homes. For each of the factors, a table of values is presented in the paper and proposal of energy scale for labeling purposes also provided.

Classification system for lighting design under condition of mesopic photometry

However, recommended system for mesopic photometry was already stated in 2010 a lot of issues are still open to solve them with respect to assessment of the adaptation luminance which is required for the computation or determination of the mesopic photometric quantity for example luminance or illuminance. This is mainly dependent on visual field of observer and also value of this photometric quantity is different for various situations in scene of the visual field of observer. Especially it can be shown that in outdoor lighting system applications is determination of the adaptation luminance critical depending on situations on the illuminated area. For these measurements are appropriate image photometers which are able to provide full information about spread of luminance in the picture. Data from image are valuable for investigation of adaptation luminance in detail. The paper deals with various situations which occur on the road under public lighting to investigate of possibility of assessment of adaptation luminance from images provided by the measurement with the image photometer. The results can be used for creation of appropriate classification system for practice and lighting designer to allow calculation of the photometric parameters at roadlighting design.

Influence of the calculation grid density to the selected photometric parameters for road lighting

Calculation and measurement of performance parameters of public lighting are performed in a grid of points defined by the CIE publication 140 and European standard EN 13201-3. Calculation grid defined in these documents was created at a time of low powerful computers and less precise measuring technology. Distance between two adjacent calculating points may be a 3 m, depending on the geometry of the road. This arrangement is sparse view of the fact that the present used computer can cope with much more denser grid in a short time and the measurement can be performed by the luminance analyzers. Between the results of the calculation with different grid densities of calculation points may be significant differences. This fact may influence the new optical systems and some LED luminaires which as found by measurement may contain various local extremes in the light intensity distribution curve. In calculating of performance parameters of public lighting and given the current used grid density these extremes may fall between calculation points and thus may not be included in the calculation. The solution is to propose a new density of calculation points which would be designed with respect to current possibilities of computer and measuring technology. The paper deals with the influence of grid density to the resulting photometric parameters of public lighting. In computing software will be used calculation grid of points according to EN 13201-3 and calculation grid with densification of calculation points in order to capture given local extremes to the resulting parameters The results will be used in the preparation of future revisions of normative documents, which provide a method for determining points of calculation and measurement grid.

Comprehensive view of LED products in luminaires

Nowadays, the LED technology is still more and more forthcoming technology. LED luminaires slowly replace traditional luminaires because their energy consuming in comparison with light output expressed by means of luminous efficacy lm/W increase to higher values what certainly save electrical energy consumption. At the present the popular way traditional light sources are replaced by LED retrofit lamps which has socket as traditional fluorescent lamps or light bulbs which can be easily mounted into traditional luminaires. The users are requested by LEDs, and they often do not realize the impact of exchange in a conventional lamp. The paper deals with electrical and photometric characteristics of LED retrofits, which are intended as a replacement for linear fluorescent sources. The above is a detailed analysis of the electrical wiring and also is shown the difference in SPD of individual light sources.

Analysis of non-recoverable lighting loses of luminaires

Maintenance factor of lighting system is hot topic in the lighting engineering. At the present is still not solved the question about used luminaires and degradation of materials in time from which consist the body of luminaire. Maintenance factor as parameter for practical maintenance of lighting system is very important aspect for design of lighting system from the level of the project to real installation. The paper deals with measurement system of obsolete luminaires with various optical systems. By the described procedure in the article is possible determine percent ratio of non-recoverable lighting loses which are undoubtedly very important part of the maintenance factor. Enon-recoverable lighting losesven more the paper describe the non-recoverable loses of various optical systems mounted in the real luminaires as diffuser, prisms, opal, frosted and clear optic.

Home Lighting: A Challenge to Improve and Standardise

Investigation presented in the paper aims to map the current situation in home lighting in order to acquire an imagination on preferences and solutions applied by end users – inhabitants, by means of available technologies and taking into account the inheritage of existing systems as well as habits of mind. Besides qualitative findings, quantitative assessment of lighting performance and estimation of energy performance is in the focus of investigation as well. Assumption of the investigation relies on the fact that what is installed in homes for lighting, selected, arranged and installed by the user, is felt by the user as illumination satisfying his needs in all aspects (aesthetic function, lighting control etc.). Questionaire is selected as the method of investigation. To achieve the needed level of reliability of data and because measurements of the illuminance are needed, the questionaire is to be completed by a professional investigator. The questionaire-based investigation is expected to provide a vast of useful information on home lighting. The paper is aimed to present the method which can be applied worldwide and to publish the results of analyses performed over data acquired on national level. Results of investigation are intended to be used for the standardization of home lighting requirements and the preparation of guidelines based on good lighting practice.

Energy performance numerical indicators of public lighting

Energy performance assessment for lighting systems is recognized as an important tool for promotion of energy efficient lighting technologies. Based on European directives, components of lighting systems are subjected to eco-design requirements, and lighting systems in buildings are evaluated for energy performance. Now, similar activities are running in the field of public lighting. This paper brings a brief state-of-the art in the standardization process and aims to inform about partial research studies which have to contribute to the preparation of a new European standard.