Because quality of light is such a broad term, and because it includes so many different aspects, precisely defining it is difficult. It’s like asking what “quality of food” might mean. Quality of food could refer to the quality of the ingredients used in a dish, and to the expertise with which they’re combined—the proportions, the seasoning, the cooking method and time, and so on. It could also refer to your experience of serving that dish in a restaurant—an experience that includes presentation, taste, price, and how it makes you feel.
Quality of light is similar. It refers on the one hand to the ingredients of light—the different measurable aspects of luminaires and the light they produce. And it refers on the other hand to the perception of light—how light influences the look of spaces and objects in different applications, and how it affects the people who use and manage those spaces.
Several well-known measures quantify the physical characteristics of light, such as Color Rendering Index (CRI), Unified Glare Rating (UGR), and Correlated Color Temperature (CCT). These measures are calculated from the photometric measurements and are typically published as part of a luminaire’s technical specifications. But being able to fully describe the link between the perceived light attributes, physical light characteristics, and technology variables is still insufficient to describe the overall light quality because critical application knowledge is missing. For example, how we perceive colors and whites
Furthermore, like most of the new technologies, solid-state lighting also provides new possibilities to differentiate in quality of light like
Quality of light isn’t one specific easy-to-define term, but rather a coordination of several different but related considerations. The technical measurements of light output
As always, the ultimate objective is to specify and deploy the right solution for a customer. Because there
And that conversation will continue to expand and grow. New approaches to connected lighting are adding further non-visual considerations to
Click here to download the full white paper on quality of light and how certain characteristics need to be revisited in the era of Ledification.