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In this paper, a technical and financial study about implementation of photovoltaic (PV) powered LED (light emitting diode) system to be used as traffic lights in a principal avenue of Bogotá city was done. Traditional traffics lights were compared with the new LED system taking into account design and economical parameters. 3 different systems were studied: traditional traffic light, LED traffic light, stand alone PV-powered LED system near to support (SALED) and stand alone PV-powered modern traffic light (SAMTL). The study indicated that in our special case the best option is LED traffic light, it reduces energy consumption about 88% and after 3 rd year it is lees expensive than traditional system.

The aim of the present study was to investigate whether, after scoring a goal, the team becomes more vulnerable to conceding a goal soon after. A total of 518 results were collected and integrated the data of the present study. The independent Chi-square test was used to analyze the data. The values of adjusted residue were observed, and all values outside the range of -1.96 to 1.96 were considered. All analyzes were performed using α = 5%. The scoring goal equalizer moment happened in the first-quarter 109 matches (21.0%), second-quarter 156 matches (30.1%), third-quarter 127 matches (24.5%), and fourth-quarter 126 matches (24.3%), totalizing 518 (100%) matches, but no association between season and scoring goal equalizer moment (χ² (30) = 28.196, p>0.05; Cramer’s V test: 0.135). The data collected showed that the equalizing goal can occur at different moments of the game, not only right after the first goal is score.