Working in the dark requires quality lighting of the construction site. To illuminate large open spaces, floodlights are used to create a powerful directional luminous flux, which improves visibility of working areas, reduces the risk of occupational injuries and improves overall safety at the construction site. Analysis of construction organization projects developed in period of 2014–2024 years revealed that almost all projects determine the number of floodlights for outdoor lighting of construction sites for incandescent lamps using the specific power method. Due to the fact that incandescent lamps are prohibited at the legislative level, LED floodlights are actually used on construction sites in violation of project requirements. This can affect the quality and safety of work, as well as increase the cost of lighting. The results of the study showed that the method of specific power provides at the required level of average illuminance on the horizontal plane, but can only be considered as a preliminary calculation and in the projects of construction organization should not use them, because the method does not take into account other mandatory lighting characteristics that determine the safety of work at the construction site. For the device of general illumination of the studied construction site preferable are floodlights with a capacity of 70 W in the number of 28 pcs. Other LED floodlights turned out to be more than (1.04–4.64) times more expensive to operate and maintain.
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• illumination modelling
• specific power method
• construction site lighting
• LED floodlights
• visibility of work areas
• occupational safety