horizontal - vertical
Focusing on horizontal lighting is frequently in line with the decision to plan functional, user-orientated light. This applies to the case of lighting for workplaces for instance, where the lighting design is primarily aimed at giving uniform lighting for horizontal visual tasks. In such cases, vertical lighting components are predominantly produced by the diffuse light that is reflected by the illuminated, horizontal surfaces.
The decision to plan vertical lighting may also be related to the task of fulfilling functional requirements when illuminating vertical visual tasks, e.g. for shelves, blackboards or paintings. However, vertical lighting frequently aims to create a visual environment. Vertical lighting is intended to emphasise the characteristic features and dominant elements in the visual environment. This applies not only to the architecture itself, whose structures can be clearly portrayed by illuminating the walls, but also to the accentuation and modelling of the objects in the space.