Abstract—We carried out measurements and lighting
simulations of an existing office building in order to clarify the
characteristics of indoor lighting environments using daylight
with a light shelf. Paired comparison measurements were
performed to elucidate the difference between using only a light
shelf and using a light shelf with a blind in terms of horizontal
illuminance and window luminance. Next, the effect of the light
shelf’s presence or absence on indoor lighting environments was
verified through lighting simulations.
Measurements and simulations revealed that when a light
shelf was available, the luminance of the upper part of the
window was higher than that of the lower part, suggesting that
glare does not result from the lower part of the window. We also
found that using a light shelf increased horizontal illuminance
by about 10% over the case of no light shelf. The illuminance
distribution of the ceiling indicated that illuminance was high at
the window and that reflected diffuse light reached the back of
the room, so that it was obvious effect on the horizontal
illuminance distribution.
Index Terms—Daylight, measurement, lighting environment,
light shelf.
The authors are with The University of Kitakyushu, Japan (e-mail:
t2mbb011@eng.kitakyu-u.ac.jp; shiraishi@kitakyu-u.ac.jp).
[PDF]
Cite:Hideaki Kido and Yasuyuki Shiraishi, "Characteristics of Indoor Lighting Environment Using Daylight with a Light Shelf," International Journal of Environmental Science and Development vol. 4, no. 6, pp. 643-646, 2013.
