Understanding RG Groups in Architectural Lighting
What Are RG Groups?
In architectural lighting, visual comfort goes beyond the look of light. It also concerns how light affects the eyes over time. The Risk Group (RG) classification system, defined by IEC/EN 62471, measures the photobiological safety of light. It checks for potential harm from optical radiation, especially blue light. This is crucial in spaces like hotels, galleries, offices, or wellness zones, where people spend long hours under artificial light.
Levels of Risk and Design Influence
The four RG levels are: RG0 (Exempt), RG1 (Low Risk), RG2 (Moderate Risk), and RG3 (High Risk). Most architectural luminaires fall within RG0 or RG1. These are safe for everyday use. However, not all RG0 products are the same. Risk level depends on several factors, including beam intensity, viewing angle, spectral content, and most importantly, the light source design.
The Value of Deep Light Positioning
Take the Profondo luminaire as an example. Its deep-positioned source reduces direct glare and limits eye strain. This design choice helps maintain an RG0 classification—even at higher output levels. Since the LED is not directly visible, the beam remains soft and controlled. Comfort and safety both benefit.
How Colour Temperature Affects Risk
CCT also plays a role. Cooler tones such as 4000K carry more blue light, which may raise the risk level. Warmer tones like 2700K or dim-to-warm reduce blue content. These options suit hotels and homes, where a softer atmosphere is key. They also help keep the luminaire within RG0.
Choosing the Right Product
For designers and specifiers, understanding RG levels helps guide smart product choices. Projects in retail, education, or healthcare benefit from deep-set optics that reduce visual risk. Luminaires such as Profondo, Casa M, and Casa M Alto offer safety without compromising light quality or aesthetics.
RG classification is not just a regulation. It’s part of the quiet design work that protects people’s well-being—project after project.
