Luminance Ratio

Luminance Ratio

 

a dimensionless quantity used in illuminating engineering to express quantitatively the difference between visual (light) sensations evoked by two adjacent surfaces of the same color. If L1 and L2 are the luminances of the surfaces being compared and L1 = L2 + nΔL, where ΔL is the luminance threshold, or minimum difference of luminance that can be discerned by eye, the luminance ratio of the first surface to the second will be equal to n.

References in periodicals archive ?
The process covers two ranges of tests: optical performance, which includes testing for luminance ratio, color, uniformity; and physical performance, to check correct functioning after exposure to water/dust ingress, vibration, impact, and temperature cycling.
With its high luminance ratio, exceptional image quality and stability, the Nio proveed to be the ideal solution.
2] and a luminance ratio between task and window below 1:100, and the higher level above 1.
Bezold-Brucke hue-shift as functions of luminance level, luminance ratio, interstimulus interval and adapting white for aperture and object colors.
the luminance ratio between the background and the most luminous pixels constituting the symbol) and is not affected by antialiasing.
Existing guidelines (for example, the ILE Outdoor Lighting Guide [ILE 2005]) tend to recommend a luminance ratio between an object and its background according to the degree of conspicuity (saliency) required, with a higher luminance contrast being recommended for a higher degree of conspicuity.
Productivity can be diminished when glare, ceiling reflections, visual comfort probability, luminance ratios, spacing criteria (SC), and flicker effects are not considered.
elliptipar's asymmetric reflector produces an even wash of light across a surface from one edge, helping to maintain comfortable luminance ratios in low-energy spaces.
The system creates balanced luminance ratios with energy usage at 0.
The IESNA has developed guidelines for acceptable levels of nonuniformity expressed in terms of luminance ratios between surfaces in the FOV.
IBL technique is particularly useful for visual comfort and performance metrics, where interior luminance ratios and accurate depiction of window luminance distributions are critical.