adaptation luminance

[‚a‚dap′tā·shən ′lü·mə·nəns]

(optics)

The average luminance, or brightness, of objects and surfaces in the immediate vicinity of an observer estimating the visual range. Also known as adaptation brightness; adaptation illuminance; adaptation level; brightness level; field brightness; field luminance.

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References in periodicals archive ?

mes]([lambda]) attains a maximum value of 1, and m is a coefficient dependent on the adaptation luminance and spectrum.

Road lighting quality, energy efficiency, and mesopic design - LED street lighting case study

0) corresponds to the magnitude of the effect of spectrum, increasing as adaptation luminance decreases.

If it is known that the adaptation luminance will be at or below 3 cd/m2, mesopic multipliers can be used to transform recommended values from photopic to mesopic.

A procedure for determining target illuminances

DGI is computed from a formula that was developed to account for the effects of source brightness, size, location relative to line of sight, and adaptation luminance.

Visual comfort analysis of innovative interior and exterior shading systems for commercial buildings using high resolution luminance images

In practice, adaptation luminance is usually taken as the average luminance in the relevant viewpoint, but it is a gross simplification.

The effect of luminance distribution patterns on occupant preference in a daylit office environment