Colors are rarely perceived under perfect conditions. A shade chosen in the showroom can suddenly look completely different on the wall. A fabric sample can change from warm to cool depending on the room. Packaging looks different under studio lighting than it does later in retail. The color itself hasn't changed – but the light around it has.
This is precisely one of the biggest challenges in design, interior architecture, branding, and production. Understanding why this happens is the first step toward managing it effectively.
Light is a Part of Color
Colors often seem like something fixed and unchangeable. In reality, however, our perception depends entirely on the light that falls on them. Light sources differ mainly in two aspects: color temperature and light quality.
Color temperature is measured in Kelvin (K) and describes how warm or cool a light source appears. A classic incandescent bulb is around 2700K and produces a warm, slightly amber light that emphasizes yellows, oranges, and reds. A bright LED office light is often 5000K or above and produces a cooler, bluish light, which can make the same color appear sharper, grayer, or more objective. Daylight also changes throughout the day – warmer at sunrise and sunset, more neutral and cooler at midday.
The second factor is color rendering quality, measured by the Color Rendering Index (CRI). A light source with a high CRI value (close to 100) reproduces colors with similar precision to natural daylight. Light sources with a low CRI – such as some fluorescent tubes or cheap LEDs – can, however, flatten or distort colors. Two rooms with the same brightness can make the same color appear completely different if their CRI values vary significantly.
This means that a color chosen from a color swatch, a photograph, or a screen will not necessarily look the same in every environment. A soft neutral tone can appear creamy under warm light, flat and lifeless under poor lighting, or cool and architectural under bright white LEDs.
When the Same Color Suddenly Looks Like Two Different Ones
One of the most impressive effects of variable lighting is the phenomenon called metamerism. This is when two colors appear identical under one light source but differ significantly under another.
This happens because colors can be created by different pigment or dye combinations, which absorb and reflect light differently. Under a specific light source, these differences remain invisible. If the light changes, the deviation suddenly becomes apparent. A paint finish that perfectly matches a fabric in the showroom can look significantly different in the room under evening light. A printed label that precisely matches the product under studio conditions can suddenly deviate under warehouse lighting.
For designers, manufacturers, and anyone working with color-critical production, metamerism is a real and practical problem. It is not a defect of a single product but a consequence of the interaction of light and materials.
The Same Color, Different Rooms
In addition to the physical properties of light sources, the environment itself also influences color perception. A north-facing room in the UK receives indirect, cooler daylight for most of the day. Colors there usually appear cooler and slightly grayer than in a south-facing room with direct afternoon sun. Interior designers therefore often recommend testing wall colors directly in the respective room at different times of the day – because a warm off-white tone can suddenly appear cool and flat in the afternoon.
In retail, another layer is added. Lighting there is rarely chosen neutrally – it is specifically used to make products appear more attractive. Warm spotlighting in fashion stores flatters skin tones and makes fabric colors appear richer. Bright white light in the supermarket ensures that fruits and vegetables look fresher. If a packaging designer approves a label color under studio light, it can still look different under the LED lighting on the shelf. Such differences are often subtle but can affect the visual consistency of a brand.
The challenge also applies to product photography, showrooms, trade fairs, and any environment where a design is evaluated outside of its final context.
Why Standardized Color Systems Help
All these examples point to the same fundamental problem: color is not stable in its perception. It depends on conditions that are constantly changing and that no one can fully control.
This is precisely why standardized color systems exist. Physical references like Pantone, RAL, and NCS create a common, reliable point of reference for designers, manufacturers, suppliers, and customers – regardless of lighting conditions or screens.
Pantone is frequently used in branding, printing, packaging, and product design. Instead of describing a color as "warm gray" or "dusty blue," a Pantone reference defines a specific, reproducible shade that a printer in one country can implement just as well as a manufacturer in another.
RAL is primarily used for architectural coatings, powder coatings, signage, and industrial surfaces, where consistency across large areas and long production runs is crucial.
NCS, the Natural Color System, is based on human color perception rather than pigment mixtures or printing processes. It is particularly helpful in architecture and interior design, as it's not just important what color is used, but also how it is perceived in the space.
None of these systems completely eliminate the influence of light. A Pantone color under a 2700K lamp will still look different than the same reference in daylight. But they create a fixed point of reference. When colors need to be approved, communicated, or consistently reproduced, physical color standards eliminate the uncertainty caused by light, screens, and subjective perception.
Colors will always be influenced by their surroundings. Standardized references don't change that. However, they ensure that all parties involved work from the same starting point – regardless of where they are or what the light is like at that moment.
