Short answer
Four things change between a shop and a home: the spectrum of the light, its level, the surroundings, and what the item is being matched against. Shops are often several times brighter than a living room and lit to make colours vivid, and your item and the thing it must match at home may be metameric — matching under one light but not another.
Perceived colourfulness rises with luminance, an effect described by R. W. G. Hunt in the 1950s. Retail interiors are commonly lit in the hundreds of lux, with display spotlights far higher, while a living room after dark can be around 50 lux. The same cushion therefore looks more saturated in the shop simply because there is more light on it. Research reviewed alongside TM-30 finds the reverse effect in lighting preference: at high illuminance people want little extra saturation, while at low levels a noticeable chroma boost is needed to look right — one reason warm, dim homes make shop-bought colours look flat.
TM-30's specification guidance names retail and display among the applications where a Vividness intent — deliberately raised saturation — can be the aim, and Preference lamps with somewhat boosted reds are common in shops, hospitality and homes. Such lamps are not wrong; they are designed to sell, and they make reds, oranges and wood tones warmer and richer than daylight or an ordinary home LED would. The effect is strongest on the colours they target, which is why a red jumper can disappoint at home while a grey one does not.
A new throw bought to match a sofa is judged against your memory in the shop and against the real sofa at home. Even if you took a sample, the two textiles were almost certainly dyed with different recipes, so their reflectance spectra differ and they may match only under the shop's light. Home lighting, with its different spectrum — typically warmer, and often from a different LED phosphor mix — reweights those spectra and the match separates. The more different the materials (paint against fabric, plastic against wood), the likelier this is.
In a shop your eyes are adapted to a bright, often cool-white space, and the item sits among many other colours, often against white fixtures. At home it sits against your walls and floor, which push its appearance away from their own colour by simultaneous contrast, under a warm white your eyes treat as neutral. A small swatch also reads differently from a large area. None of this changes the item; all of it changes what you see. The table summarises the lighting side of the difference, from the site's viewing-environment dataset.
| Setting | Typical illuminance (lux) | Light | What your eye does |
|---|---|---|---|
| Retail store | 200–700 | LED, often tuned for vivid rendering — raised red chroma — rather than pure fidelity. | Higher light level and chroma-boosting spectra make colours look richer than they will at home. |
| Office | 320–500 | Neutral-white LED or fluorescent; fluorescent spectra are spiky with mercury lines. | Adaptation to a neutral white; colours look moderate, neither boosted nor muted. |
| Typical home living room after dark | about 50 | Usually warm-white LED or, in older installations, incandescent or halogen; often mixed sources in one room. | At low light colours look less saturated and small differences disappear; the eye adapts to the warm white and calls it neutral. |
| Overcast daylight | 100–1,000 | Smooth, diffuse and fairly neutral: cloud droplets scatter all visible wavelengths almost equally. | Lower light reduces apparent saturation, and the absence of shadow makes surfaces look flatter. |
Why: Different dye recipes, metameric under the shop's light; plus a higher light level in the shop.
Fix: Take a real offcut or cushion to the shop, compare by a window and under a phone torch, and ask to take a sample home.
Why: Bright store lighting and a small chip against white versus a large area at home at lower light.
Fix: Paint a large sample on the wall and judge it at night under the room's lamps as well as by day.
Each statement is labelled by kind — established fact, a standard’s requirement, observed market data, a convention, or Colourwise’s own interpretation or analysis — with the strength of the evidence behind it.
FactModerate evidence
Light level strongly affects colour perception: as illuminance rises, the preference for increased saturation falls, and at very low light a larger chroma increase is needed for maximum preference.
Caveat: Summarised from studies cited in the TM-30 tutorial; preference is not the same as accuracy.
StandardStrong evidence
TM-30 Annex E identifies retail as an application where Colour Preference may dominate, and specific entertainment, display or retail applications as ones where Colour Vividness may.
FactModerate evidence
A home living room after dark can be lit to around 50 lux, whereas typical interiors for which colour rendition criteria are written are lit to roughly 200–700 lux.
Caveat: The 50 lux figure is a single reported survey value; homes vary widely.
Source: Lux (Wikipedia), table of example illuminances; Tutorial: Background and Guidance for Using the ANSI/IES TM-30 Method for Evaluating Light Source Color Rendition (LEUKOS 18:2, 191–231)
Colourwise interpretationLimited evidence
Most 'matched in the shop' disappointments come from the combination of higher light level and vividness-oriented spectra in the shop, with metamerism deciding which colours are worst affected.
Based on: Combines the light-level and retail design-intent evidence on this page with the mechanism of illuminant metamerism; not a survey of returns.
Caveat: Individual cases can be dominated by any one of the four factors.
Reviewed 29 September 2026. Colourwise summarises its sources in its own words and does not reproduce standards text or proprietary colour data. Spotted an error? Tell us.