Viewing conditions on worktops when writing
in a hall lighted by electric lamps
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University of Bielsko-Biala |
Publication date: 2020-10-01
BoZPE 2020;(1):27–37
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ABSTRACT
Multimedia projectors are used increasingly in academic centres and ensuring good visibility
of the screen requires the limiting of light in classrooms. The purpose of the paper was to
evaluate the quality of artificial general lighting on worktops used for writing in a didactic
room. It was measured with full lighting and for three variants (degrees) of lighting dimmed
during the display of a multimedia presentation. There were 24 measuring points set in
the room and the intensity of the lighting was measured with a luxmeter. After setting
the potentiometer half-way between the maximum and minimum level of lighting, which
switched on automatically once the projector was on, the brightness at most of the measuring
points was less than the required 500 Lx. With the minimum lighting for this mode,
the visual discomfort was recorded in the students’ working areas. Therefore, a conclusion
was made that didactic spaces with multimedia projectors should be additionally equipped
with task lighting such as lamps fixed on every worktop used for note taking. Introducing
smart lighting systems which facilitate dynamic collaboration of general and local lighting
would help to improve viewing conditions in the room and reduce energy consumption of
electric lamps.