Disconnecting consumers from electricity can lead to environmental disasters. One reason for the outage may be lightning hitting power lines or directly into a building or structure. The article considers two variants of lightning protection: long-lasting and free-standing.

Keywords: lightning protection, lightning arrester, lightning discharge, electricity theory, charge receiving unit

The technique for calculating the basic geometric parameters of an LED lighting device is considered. The developed design allows to calculate the optimum parameters of the lighting device ensuring an even distribution of illumination with minimal energy consumption

Keywords: Illumination, LED lighting, surface contour, light distribution, surface plane, fluorescent lamps, lighting system, сartesian system, plane