Light Exit Window Luminance Profiling for Glare Reduction
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Solution Overview
Problem
Existing lighting arrangements face challenges in reducing discomfort glare while maintaining average luminance, often requiring increased costs, reduced efficiency, or larger light-emitting areas.
Innovation Solution
A luminaire with a light exit window that modifies luminance through a patterned design, creating a luminance profile with specific gradients and intervals to induce a Cornsweet illusion, reducing overall glare without decreasing luminous intensity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If the luminous intensity is kept relatively low in certain directions to avoid discomfort glare, then the luminance of the luminaire remains below a given limit, but this leads to added cost in optical beam shaping components, reduced efficiency and/or requirement of higher number of luminaires
Solution Approach 1:
The light exit window is divided into different zones (first zone, second zone, third zone) with distinct luminance characteristics. The first zone has a first luminance level, the second zone has a second luminance level different from the first, and the third zone has a third luminance level. This local differentiation creates the Cornsweet illusion effect where the human visual system perceives the luminaire as having lower overall luminance, thereby reducing discomfort glare without requiring additional optical components or reducing actual light output.
2Object-affected harmful factors
If the light emitting area is made relatively large to reduce discomfort glare, then the luminous intensity can be maintained, but this results in added cost in material usage and/or transport of the luminaires
Solution Approach 1:
The invention changes the luminance parameters across different zones of the light exit window rather than simply increasing the overall light emitting area. By creating specific luminance profiles with multiple zones having different luminance levels (first luminance, second luminance, third luminance), the patent achieves glare reduction through optical parameter manipulation instead of physical size increase, thereby avoiding additional material usage and transport costs.
3Object-affected harmful factors
If optical beam shaping components are added to reduce discomfort glare, then the luminance distribution can be controlled, but this increases the cost and reduces efficiency
Solution Approach 1:
The patent merges the glare control function directly into the light exit window structure itself, rather than using separate optical beam shaping components. The multi-zone luminance distribution (first zone, second zone, third zone with different luminance levels) is integrated into the window design, eliminating the need for additional optical elements and maintaining illumination efficiency while achieving discomfort glare reduction through the Cornsweet illusion effect.
Data Source
AI summary
A luminaire (100), comprising at least one light source (110) arranged to emit light source light (120), a light exit window (130), wherein the emitted light is arranged to exit the luminaire through the light exit window as luminaire light (135), wherein the light exit window is configured to influence the luminance, L, of the light source light, for generating a profile of the luminance, LP, of the luminaire light as a function of a length 5 dimension, x, of the light exit window, defined from a center (310) of the light exit window to a periphery (320) of the light exit window.