Light pollution measurement; Example of Gaziantep city

In this study, the amount of light energy escaping to space from artificial lighting starting at least 3 hours after sunset was measured in the area consisting of 49 km2 and 49 grids in the central districts of Gaziantep (Sahinbey-Sehitkamil). The other regions are not shown on the map because they are scattered and will cause a big deviation in the average value. In this study, measurements were made with the Sky Quality Meter (SQM) device LU-DL model. As a result of the measurements, the light pollution map of Gaziantep province was made using the ARCGIS program, and while light colors indicate light pollution, dark colors indicate areas with less light pollution. The studies were taken between 21:00 and 24:00 at night on certain dates of February, March and April (without moon, cloudless). As a result of the measurement, the amount of energy lost in the measurement points of Gaziantep province is 89.8 million lumens in terms of luminous flux. Its financial equivalent is approximately 2.30 million Turkish liras. In order to prevent light pollution, the lighting fixtures used in park and street lighting should be of a new generation low pressure sodıum lamb technology, parallel to the ground, not shining light on it, and white or almost white in color. Relevant units of local governments and other institutions should put international standards on city lighting on the agenda and prevent energy waste in the province by establishing their current policies in this direction. Keywords: Light Pollution, Loss Of Energy, City Enlightment