The activation of lamps and blinds according to the perception of lighting at the room entrance

Abstract

This article considers that visual perception influences the switching on electric lighting and blinds closing. The objective is to study the relationship of visual perception from the door position, with the switching on electric lighting and with the blinds down position. The methodology consisted of experiments conducted with 41 participants to inquire about their visual perception, and switch light on and blinds closing events data. By using an HDR image technique, the mean window luminance (Lja), DGP and DGI were analyzed because of their correlation with the visual perception, the switching lighting on and the blinds down position. The DGP index presented little sensitivity because of their values that did not demonstrate apparent visual discomfort situations. For the DGI, the range set for the situation of the lighting off and blinds opened was between 18.4 ± 1.0 and 23.8 ± 1.0, and the visual perception of the room is "bright". To mean window luminance (Lja), between 1636 ± 302 cd/m² and 4981 ± 419 cd/m², the lighting was off, and the blinds opened. The conclusion is that the proposed intervals of DGI and the mean window luminance can be used to construct behavioral models to support the electric energy use simulation in buildings and to enhance the daylight design of interior space.

Keywords:
Artificial lighting; Daylight; Visual perception; User attitude; HDR images