This is a study of the specular reflection on a task placed between a viewer and an under-shelf light source in a constrained open-plan office cubicle workstation environment. Specular glare reduction and the optimi- zation of the location of the reflected image of a lamp may be measured and accurately predicted by the methods presented in this paper. These may be achieved by proper and optimal installation of light sources producing light of a high degree of polarization in open- plan office cubicles according to the height of the viewer to help in minimizing both direct glare and reflected specular glare. A diverse panel of human subjects using
a glare reduction rating at the 50th percentile female eye height has confirmed these methods. It is surmised that human subjects of progressively higher eye heights will see similar changes, but less specular glare reduction because of smaller viewing angles.
This study successfully uses simple linear polarization optics for lighting optimization. However, luminaires have a definite width and length, may be covered by different light diffuser lenses and also may have different reflector designs. The effects of these dimensions on glare reduction for different viewing positions needs to be considered in future studies and in specific applications. Other lighting configurations such as side-lit lamps, different reflective systems and lenses will not follow the same optimization procedures as shown in this study.
From human testing of the glare reduction rating, this study clearly shows that polarized lighting affords pre- dictable specular glare reduction if the task light is the sole source of illuminance, even for matte finish paper. If the ambient, diffuse lighting is increased, then the benefits of the use of polarized task lighting are less, but still significant, depending on the gloss value of the viewed material and the ratio of the illuminance of ambient light to the task light.
Human glare reduction ratings correlate well with empirical specular glare reduction as calculated from luminance meter measurements. For a specific surface and lighting condition, the glare reduction ratings may also be simply correlated to the theoretical percent glare reduction on a reference surface, such as glass.
The ergonomics of lighting clearly needs to take worker stature into consideration for worker comfort
and productivity. Because of their heights, 95% of the males are not looking directly into an under- shelf cubicle light source of the common height of 410mm, while more than 50% of the females are exposed to direct glare from the light source. Female viewers who are of smaller heights with larger view- ing angles will see an increase of 6–10% reflective, specular glare over taller male viewers when using non- polarized light, as seen in Table 2. This may help to explain the results of the research of North (1991) that shows a 50% increase of glare discomfort in women over men.
These methods may be applied to other areas of study, such as in the field of education, where children are even shorter than adult females, and their heights should also be taken into consideration for proper reading and work illumination. The analysis of the geometry of lamp placement versus the viewer may be used for other illuminating studies, such as for forward over-head lighting.
This is a study of the specular reflection on a task placed between a viewer and an under-shelf light source in a constrained open-plan office cubicle workstation environment. Specular glare reduction and the optimi- zation of the location of the reflected image of a lamp may be measured and accurately predicted by the methods presented in this paper. These may be achieved by proper and optimal installation of light sources producing light of a high degree of polarization in open- plan office cubicles according to the height of the viewer to help in minimizing both direct glare and reflected specular glare. A diverse panel of human subjects using
a glare reduction rating at the 50th percentile female eye height has confirmed these methods. It is surmised that human subjects of progressively higher eye heights will see similar changes, but less specular glare reduction because of smaller viewing angles.
This study successfully uses simple linear polarization optics for lighting optimization. However, luminaires have a definite width and length, may be covered by different light diffuser lenses and also may have different reflector designs. The effects of these dimensions on glare reduction for different viewing positions needs to be considered in future studies and in specific applications. Other lighting configurations such as side-lit lamps, different reflective systems and lenses will not follow the same optimization procedures as shown in this study.
From human testing of the glare reduction rating, this study clearly shows that polarized lighting affords pre- dictable specular glare reduction if the task light is the sole source of illuminance, even for matte finish paper. If the ambient, diffuse lighting is increased, then the benefits of the use of polarized task lighting are less, but still significant, depending on the gloss value of the viewed material and the ratio of the illuminance of ambient light to the task light.
Human glare reduction ratings correlate well with empirical specular glare reduction as calculated from luminance meter measurements. For a specific surface and lighting condition, the glare reduction ratings may also be simply correlated to the theoretical percent glare reduction on a reference surface, such as glass.
The ergonomics of lighting clearly needs to take worker stature into consideration for worker comfort
and productivity. Because of their heights, 95% of the males are not looking directly into an under- shelf cubicle light source of the common height of 410mm, while more than 50% of the females are exposed to direct glare from the light source. Female viewers who are of smaller heights with larger view- ing angles will see an increase of 6–10% reflective, specular glare over taller male viewers when using non- polarized light, as seen in Table 2. This may help to explain the results of the research of North (1991) that shows a 50% increase of glare discomfort in women over men.
These methods may be applied to other areas of study, such as in the field of education, where children are even shorter than adult females, and their heights should also be taken into consideration for proper reading and work illumination. The analysis of the geometry of lamp placement versus the viewer may be used for other illuminating studies, such as for forward over-head lighting.
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