Performance evaluation of energy efficient lighting associated with renewable energy applications. The authors declare no conflict of interest. To ascertain the luminance emitted by the luminous source as a function of electrical power, we used a photometer that measures luminance (see Figure 2) and a wattmeter that measures electrical power. As shown in Figure 1, the lamps are connected in parallel to a variable power supply, which provided different luminance values. The luminous source consisted of a system of 15 halogen lamps arranged inside a box and covered by a diffusing screen. Both images (object and standard images) had to be taken under the same conditions (exposure time, ISO value, aperture, camera-object distance, etc.). To detect the luminance through any image (object image), we used a standard image of a luminous source of known luminance. The information obtained in each pixel of its sensor can thus be related to the real luminance value of luminance captured in an image. This research studied levels of street lighting and calculated the energy efficiency in various streets of Deifontes (Granada), through the use of aerial imagery.Įven though this camera is not an instrument that measures luminance magnitude, it is possible to transform it into a photometer. In this way, modifications or improvements can be made to achieve greater energy savings and, if necessary, to correct the distribution or configuration of public lighting systems to make them more efficient and sustainable. There is even the possibility of generating street lighting maps that provide local administrations with up-to-date information regarding the status of public lighting installations in their city. It is thus a more effective way of obtaining the data required to calculate the energy efficiency of lighting levels and electricity consumption. The main advantage of this new methodology is that it provides information about lighting installations in large areas in less time than more conventional procedures. The results of this study also confirmed that lighting measurements, installation material, luminaire position, and electricity consumption data can be easily integrated into geographic information systems (GIS). Combined with electricity consumption data from smart electricity meters, it was possible to measure the energy efficiency of public lighting installations. This article describes an innovative method for measuring lighting levels and other lighting parameters through the use of aerial imagery of towns and cities.
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