6.2.1. Offices

To select the scenarios, and in order to evaluate real cases, a survey was performed where users were asked about their interest in checking the lighting conditions of their workplace and if they thought that their level of light could be improved to achieve a better lighting quality. From the survey's respondents a total of 20 random cases were selected from the users who were interested in checking their lighting conditions and who thought that these conditions could be improved.

Once the scenarios were checked with the application, the results were divided into three different groups: places with a correct level of light, places with excess light, and places with a lack of light. Table 2 shows the number of cases selected for each.

> **Table 2.** Lighting evaluation on offices.


The first point that must be highlighted is that 35% of the evaluated cases has a level of light in compliance with the standards, even when the users think that the lighting conditions could be improved. On the other hand, the rest of the evaluated cases shows a problem with lighting, where 35% have a lack of light and the other 30% have an excess of light.

As it was said, when the application detects that the lighting requirements do not comply with the lighting regulations, different tips are shown in order to solve the problem. On one hand, in cases of a lack of light, those tips go from the substitution of the lamp for others with higher illuminance, showing as a recommendation LED lamps which have high energy efficiency, to the removing of the protector of the fluorescent lamps. On the other hand, the recommendation in cases of excess illumination are the substitution of the lamp for another with lower illuminance, decreasing at the same time the energy consumption. In the case of the study performed, the replacement of the lamp protections in cases of a lack of light and the substitution of the lamps in cases of excess light were enough to ensure the regulations' compliance. At the end, the solutions carried out not only improve and correct lighting conditions, but also help to reduce the energy consumption.

A few days after correcting the lighting problems, a new survey was conducted to analyze the user satisfaction with the lighting changes. In this new survey, when asked if they could detect the changes in lighting conditions, 69.23% of the respondents detected the differences in the lighting level of their workspaces. After, they were asked about the feeling of improvement of the lighting quality, and 53.84% of the respondents said that the new conditions were better, helping them feel less stress on the eyes. If we make a distinction between cases of excess and lack of light, it is possible to see how the users with a lack of light detect easily the differences in the light, detecting also an improvement in the quality of lighting conditions.
