Equivalent veiling luminance is defined as the luminance that would need to be superimposed on a scene in object space to reduce the scene’s contrast by an amount equal to the added retinal illuminance from scattered light on the scene’s retinal image.
In simpler terms, it is a measure of the additional luminance that needs to be present in the field of view to counteract the contrast-reducing effect caused by glare. This concept is fundamental in evaluating and mitigating the impact of glare on visual tasks and overall visual comfort.
Practical Applications
1. Glare Reduction in Architectural Lighting:
Equivalent veiling luminance is a critical parameter when designing lighting schemes for spaces with large windows or reflective surfaces. By understanding the potential glare sources and their equivalent veiling luminance, designers can implement strategies to minimize discomfort and optimize visual performance.
2. Automotive Lighting:
In the automotive industry, equivalent veiling luminance is a key consideration in headlight design. It helps engineers assess the potential glare caused by oncoming vehicles and develop headlights with optimal cutoff patterns and intensity distributions to enhance safety and reduce driver fatigue.
3. Street Lighting:
Municipalities and urban planners take equivalent veiling luminance into account when designing street lighting layouts. By strategically positioning light fixtures and considering their luminance levels, they aim to create well-lit and safe environments while minimizing glare for pedestrians and drivers.
4. Workspace Lighting:
In office environments, glare from luminaires can have a significant impact on productivity and comfort. Understanding equivalent veiling luminance allows designers to select fixtures and control systems that provide adequate illumination without causing discomfort or visual fatigue.
Equivalent veiling luminance is a pivotal concept in the realm of lighting design and glare management. By comprehending this term and its implications, professionals in various industries can create environments that balance visual comfort, safety, and efficiency. Whether in architectural, automotive, or urban lighting, considering equivalent veiling luminance empowers designers to make informed decisions that enhance the overall quality of illuminated spaces.