Currently, high pressure sodium lamps are the light source in greenhouse vegetable growing. The most promising sources of artificial lighting are LED-based irradiators. They can provide a cooler temperature environment to bring plants closer to plants. The aim of the study is to determine the economic life of sodium and LED light sources in greenhouse vegetable growing, taking into account their degradation for the harvest. LEDs, like sodium lamps, degrade during use. This leads to a decrease in the light (photosynthetic photon) flux of light sources and, as a result, to a decrease in yield. Due to this certain functional dependence on the luminous flux level, the economically feasible life of the light is predicted.

Keywords: light sources, luminous flux, LED lamps, sodium lamps, productivity, energy efficiency, economy

On November 10, 2017, new requirements came into force that apply to lighting devices and electric lamps used in AC circuits. In connection with the newly introduced requirements, calculations of power consumption in educational institutions were carried out at different times of use of the lighting load. The purpose of the research is to determine the payback period for the implementation of LED lamps instead of fluorescent lamps for various types of premises in educational institutions. The analysis of technical characteristics of LED light sources offered on the market of the Russian Federation is carried out. Based on the results of the calculations, the payback periods were obtained for the introduction of LED lamps instead of fluorescent lamps for public premises, laboratories, training workshops, as well as lecture halls of educational institutions, with different times of use of the lighting load. This can allow already at the design stage to evaluate the effectiveness of the implementation of the selected light sources.

Keywords: light sources, led lamps, fluorescent lamps energy efficiency, electric lamps, lighting systems, educational institutions