Creating the Productive Workplace

By Derek Clements-Croome | Go to book overview

Notes
1
Luminance is the quantity of luminous flux propagated in a given direction from a point on a surface. Colloquially, this is what is generally meant when we speak of the brightness of an object, although this use confuses the photometric quantity and the sensation of brightness, which depends on the state of adaptation of the eye as well as the luminance of the object (Rea, 1993).
2
Phototherapy using bright light exposure is a common treatment for seasonal affective disorder, but this use has no bearing on general lighting practice. Interested readers are directed to Rosenthal (1993) and Tam et al. (1995) for reviews.
3
Illuminance is the technical term for the area density of luminous flux incident on a surface; colloquially, we speak of 'light levels'. Lighting recommendations are specified in terms of illuminance largely because this value is in the control of the lighting specifier, although the visual system sees luminance, which is the product of illuminance and reflectance. Reflectances of walls, furnishings, floors and ceilings determine luminance but are usually not under the control of the person choosing the lighting.

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