“Glare control of the luminaries should be done at the design of the project, choosing the appliances with photometric distribution adequate to the needs and those that avoid direct emission at the critical angles”. 66|A FONDO to the adequate level, in such a way that both components (natural and artificial) fulfill the lighting needs of the people and the activities of the space. To measure the source of natural light, sensors of natural light are used. They measure the amount of natural light that reaches them generating a signal that sets the level of flow in the lamps thus obtaining the total specified level of illumination. The emergence of this technology marked a significant advance in energy efficiency by featuring an installation that adapts to real time according to the supply of natural light. This technology offers improvements in the energy consumption of an installation by regulating the luminous flux of the lamps and solves the problem of the “quantity” of artificial light needed. Another possibility offered today is “quality” of light, understood as the aspects that refer to visual comfort. Among them we could point out glare control and the chromatic aspects of light. Glare Control Glare is understood as the loss of visual capabilities caused by an excessive contrast between the luminosity of an object and its background. This could be caused by the direct emission coming from a source (direct glare) or it can be caused by the reflection of the light on a surface (reflected glare). There are two main causes of direct glare, which coincide with the spots of maximum luminosity in our visual scene: windows and luminaries. Glare control of the luminaries should be done at the design of the project, choosing the appliances with photometric distribution adequate to the needs and those that avoid direct emission at the critical angles. A way of calculating it is with the UGR (Unified Glare Ratio). The photometry of a luminary is unalterable once it is installed so the time to choose the correct luminary, one that will guarantee the desired visual comfort, is at the time of design. The other culprits of direct glare are windows. To limit the effect that results from their high luminance, two solutions