Welcome back to our KingOrnan Lighting Academy. In the last session, we delved into the Color Rendering Index (CRI) concept and its application scenarios. This time, we will discuss the concept of “Seeing the Light Without Seeing the Lamp,” also known as “concealed lighting.”
Lighting is one of the key aspects of interior design, significantly impacting any space’s aesthetics and functionality. A phrase often heard in design discussions is “Seeing the Light Without Seeing the Lamp,” or “concealed lighting.” This concept is frequently emphasized in home décor, designer projects, and lighting sales because it addresses the importance of creating a visually appealing environment while maintaining comfort and functionality. This blog explores this idea, discusses the concept of UGR (Unified Glare Rating), and offers guidance on selecting the best anti-glare values for your lighting setup.
KingOrnan Lighting Academy 5: UGR
The Concept of "Seeing the Light Without Seeing the Lamp" - "Concealed Lighting"
When we talk about “seeing the light without seeing the lamp,” we are essentially discussing a design principle where the light source is hidden, allowing only the emitted light to be visible. The goal is to illuminate a space without the distraction of visible bulbs or glaring light fixtures. This approach is especially common in modern and minimalist designs, prioritizing clean lines and subtle elegance.
This concept is frequently applied in settings that use reflective troughs or spotlights. Reflective troughs are recessed areas in walls or ceilings that house light fixtures, directing the light outward while keeping the source concealed. Spotlights, when properly positioned, can also achieve this effect, highlighting specific areas without the source being directly visible.
Achieving this effect is not only a matter of aesthetics but also a matter of comfort. Whether or not you see the light directly relates to the anti-glare properties of the lighting design. Glare occurs when intense light directly enters your eyes, causing discomfort and visual impairment. This is where UGR comes into play.
What is UGR (Unified Glare Rating)?
UGR stands for Unified Glare Rating, a numerical measure of how much discomfort glare a lighting installation causes to occupants in a given environment. It is a standardized index that rates the glare caused by lighting fixtures, with a lower UGR value indicating better anti-glare performance. The UGR scale ranges from about 10 to over 30, with the following classifications:
- UGR < 10: Barely noticeable glare
- UGR 10-16:Low glare, comfortable lighting
- UGR 16-19: Moderate glare, acceptable for most general lighting
- UGR 19-22:Noticeable glare, may be tolerable depending on the application
- UGR > 22: High glare, likely to cause discomfort
In simpler terms, UGR measures the ability of a product or surface, such as a light fixture, screen, or even eyeglasses, to control glare and prevent light from directly reflecting into the user’s eyes. Reducing glare is crucial for minimizing eye strain, improving visual clarity, and enhancing the overall comfort of an environment.
How UGR Works?
The UGR formula takes into account several factors, including:
- The luminance of each light source in the field of view.
- The observer’s position and viewing direction.
- The background luminance and how it contrasts with the illuminated area.
- The size and number of light sources in the visual field.
By calculating these elements, UGR provides a value that helps designers and engineers determine how much glare a lighting system will produce in a specific environment. For example, in office settings, a UGR of less than 19 is recommended to maintain a comfortable workspace that does not strain employees’ eyes.
Choosing the Right Anti-Glare Value: The Balance Between Comfort and Efficiency
Selecting the appropriate anti-glare value is crucial for ensuring both visual comfort and lighting efficiency. An anti-glare value between 10 and 19 is typically considered optimal, offering a comfortable visual experience without excessive brightness or harsh reflections. On the other hand, anti-glare values between 20 and 31 are generally less desirable as they may cause noticeable glare, leading to eye strain and discomfort.
Factors to Consider
- Visual Comfort:
The primary goal of selecting the right UGR is to maximize visual comfort. In environments where people spend extended periods, such as offices, classrooms, or living rooms, a lower UGR is preferable. A UGR of 10-16 is generally ideal for these settings as it minimizes glare while providing sufficient illumination for tasks like reading, working on a computer, or having conversations. - Lighting Efficiency:
While reducing glare is important, it’s equally crucial to maintain lighting efficiency. Overly high anti-glare values can result in light loss, meaning that the lighting fixture may need to work harder (using more energy) to achieve the desired brightness level. The key is to strike a balance that ensures both visual comfort and energy efficiency. - Application-Specific Needs:
Different environments have varying requirements when it comes to lighting. In areas like art galleries, retail spaces, or auditoriums, spotlights with a lower UGR are essential to highlight specific objects or areas without causing discomfort to viewers. Conversely, industrial or warehouse settings may tolerate higher UGR values as precision visual tasks are not the main focus.
National Standards and Recommendations
In many countries, including those following European standards, there are established guidelines for UGR values in different types of spaces:
- General Office Areas: UGR ≤ 19
- Drawing and Design Work: UGR ≤ 16
- Classrooms: UGR ≤ 19
- Corridors and Circulation Areas: UGR ≤ 22
According to these standards, a UGR between 10 and 16 is often considered the best choice, offering a balance between reducing glare and maintaining good lighting performance.
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Let’s Wrap It Up!
“Seeing the light without seeing the lamp” or”concealed lighting” is more than just a stylish design choice; it’s a principle rooted in enhancing both the aesthetic and functional quality of a space. Achieving this balance involves careful consideration of the UGR and anti-glare properties of the lighting setup. By understanding UGR and selecting the right anti-glare value, you can create environments that are not only visually pleasing but also comfortable and efficient.
When designing or upgrading lighting systems, prioritize low UGR values between 10 and 16 for spaces where comfort is key. With the KingOrnan, you can enjoy the benefits of effective, glare-free lighting that brightens your space without compromising on style or performance.
I hope you can better understand and apply this lighting knowledge in your future work, creating a healthier and more comfortable living environment.If you need to purchase lighting fixtures or for renovation purposes, Kingornan‘s various series of commercial lighting fixtures are your ideal choice.
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