Strategies on Visual Display Terminal Lighting in Office Space under Energy-Saving Environment

Abstract

In this work, we have studied how the vertical illuminance of the human eye position, illuminance of the horizontal work surface, and the brightness of the computer screen in the office space lighting are correlated under an energy-saving environment. This investigation was conducted in a full-scale laboratory that simulates an office space with 20 adults. It was found that when the indoor ambient lighting illuminance changes, the vertical illuminance of the subject’s eye position is affected accordingly, and the two factors are strongly correlated. On the other hand, when the surrounding environment is brighter and the vertical illuminance increases, the illuminance of the horizontal working surface adjusted by the subject during the visual display terminal (VDT) operation is significantly reduced. The horizontal illuminance value can even be lower than the value frequently employed in various countries around the world, since the computer screen brightness will be adjusted accordingly. Therefore, in an energy-saving environment, the illuminance of the horizontal working surface and the brightness of the computer screen adjusted by the users will vary with the ambient lighting. Especially in the current mainstream VDT operating environment and within a certain range of conditions, the interior setting can be lower than the current horizontal illuminance benchmark for additional energy conservation.

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“…In addition to this, vertical illuminance at the participants' eye positions and horizontal illuminance on the work surface were measured. A flowchart outlining the study, along with specific details of the experiment, is depicted in Figure 2 [20].…”

“…For each adjustment, the experimenter recorded the HI on the task plane, VI at the participant's eye location, and the luminance of the computer monitor. The sequence of independent variables models was used to determine the Latin Square Design method, as depicted in Table 5 [20].…”

“…They were strictly prohibited from consuming any neurological medications. Furthermore, participants were required to abstain from consuming alcohol, coffee, and other stimulating beverages for at least 12 h before the test, as well as refraining from smoking for a minimum of 8 h [20][21][22].…”