20|AULA cd installations of exterior lighting. As can be seen in table N°4, the results show the importance of sustaining uniform levels of lighting, avoiding the areas that require great visual effort in order to perceive the surroundings. For the analysis of the superior hemispheric flow installed it is determined that the pedestrian walkways corresponds to the areas of medium brightness or luminosity, which does not exceed 15% del total emitted flow, the maintenance factor of the installation of metal halide is 0,69 < 0,7. This shows that the installation could have problems of energy efficiency. Influence of the noncompliance of the lighting parameters in the energy classification: The total active potency for the lamp plus auxiliary equipment set was determined, obtaining 171 W yielding an energy efficiency value of 0,98 (Lux x m2)/W, which is much lower than the minimum permitted values (6,18 (Lux x m2)/W), the energy efficiency values <0,20. This places it in the worst energy classification possible, Type G, as can be seen in table N°5. Visibility of objects and the influence of color-contrast: to obtain the results of visibility it is necessary to perform a luminance analysis of the objects and the surroundings. Analysis of luminance for section 1 and 2. As can be seen in graphic 1, there is a variation in the luminance of objects, product of the incidence of the luminous flow and not the placement of the objects, since they are situated in the same way, so the modifications they suffer stem from the direct or indirect luminous incidence, for section 1 y 2, respectively. Among the luminance results obtained, there is a wide variation of the direct luminance in section 1 and indirect in section 2. Objects of white color have greater levels of luminance in both lighting systems; red objects have the lower levels of luminance. Green objects have the second best level in section 1 and 2, followed closely by the blue object that, in section 2, is characterized by having levels that are very similar to the green object. Tabla N°5. Resumen comparativo del análisis de la eficiencia energética en las instalacio- nes de iluminación para halogenuros metálicos. / Table N°5. Comparative summary of the energy efficiency analysis in the lighting installations for metal halide. Grafico No1. Luminancia de los objetos coloridos para el tramo 1 y 2 del Territorio Esso. / Graphic No1. Luminance of color objects for section 1 y 2 of the Territory Esso. Contrast analysis for section 1 y 2. Then, the levels of contrast between object and their surrounding were analyzed. The results obtained can be seen in table N°6. In section 1, the objects provide a luminance that is lower than the luminance of their surroundings, with negative values of contrast. The only exception being the color white. In the results of section 2 all the objects provide a luminance that is lower than the luminance of the surroundings, and white has the highest luminance with a contrast value closest to cero. It is important to emphasize that the contrast is negative when the luminance of the object is lower than the luminance of the surroundings, so the objects look darker. The values closer to cero, are those that have better levels of visibility. They will have positive contrast levels, values that are farther to cero which will be the ones with better visibility. Results of visibility 1 As can be seen in table N°7 and in graphic N°3, the results for section 1 show that at a distance of 30 meters all objects are recognizable, and in particular the color white has the best visibility due to its levels of contrast C=0,37; with an approval of 72% of the observers, followed by red and green, with a 24% y 4% respectively. The observer recognized as slightly more visible objects, the red with 60%, followed by white with 28% and blue with 8%. All the observers agreed that the object with best visibility was the white, the second best visibility was the red, and vice versa. It is important to emphasize that the red color had the second lowest contrast value for section 1. It was one of the objects with best visibility after white. When the observer recognized the visible object and the less visible object, the blue object and the green object became equal, with similar percentages, of 44% and 48% respectively for each visibility and with equal contrast values of -0,8, high for this section, lowering its visibility. It is important to emphasize that the object of green