I’ve spent enough years working on lighting design and techniques to know this: lighting is the silent storyteller of every physical store. While visual merchandising, layout, and scent all play their part, lighting is the tool that literally guides the eye, shapes perception, and triggers emotional state before a customer has consciously registered a single object. In experience-led
retail, where the goal isn’t just a transaction but a lasting connection, this becomes the whole game.
Contrast creates focus and desire.
A beautifully lit product on a dark, boutique-feel shelf instantly says “luxury,” “craftsmanship,” “exclusive.” That sharp luminance contrast draws the eye straight to the hero piece, and the brain reads it as precious. Emotion: desire, curiosity, exclusivity.
Warmth builds relaxation and trust.
For lifestyle, homewares, or wellness brands, soft, warm-white light (2700K–3000K) with high CRI (>95) with R9>90 mimics the golden hour. It calms the nervous system, encourages linger time, and makes materials look rich and touchable. Emotion: comfort, safety, indulgence.
Dynamic lighting creates energy and play.
In sports, streetwear, or kids’ retail, fully tuneable white light or subtle colour shifts can mirror an urban vibe, a season, or digital culture. A seamless transition from bright engagement zones to cozy lounges within the same store keeps the journey surprising. Emotion: excitement, novelty, belonging to a cultural tribe.
Vertical illumination builds brand trust.
Lighting walls, faces (staff and customers), and architecture — not just product — makes a space feel welcoming and premium. People feel good when they can see each other well; it encourages social sharing and dwell time. Emotion: inclusion, trust, confidence.
Shadow and texture tell a story.
For artisanal or heritage brands, accent lighting that rakes across textured surfaces – brick, wood, plaster – brings out depth. That
“imperfect” drama speaks to authenticity and soul. Emotion: nostalgia, connection to craft.
Why collaborating with lighting designers matters
Today’s retail lighting designer is a strategic bridge. Lighting designers ensure the brand’s visual language is expressed consistently across every sense. A luxury brand that looks clinical under 4000K loses its value proposition. A vibrant streetwear brand drowned in dim, warm light feels sleepy. We protect the brand experience from “default” specs.
Also when lighting designers collaborate early, manufacturers learn exactly what the market needs – smaller, tuneable, circular-
economy luminaires with IoT, for example – and can develop solutions that solve real design challenges.
In short, lighting doesn’t just show the product – it creates the mood that makes the brand’s offering meaningful. In an experience-led environment, where people visit not just to buy but to feel part of a story, lighting is the director of the emotional narrative.
1. The “flat and finished” approach – ignoring the human vertical surface.
Too many stores light only the horizontal plane (product tables and floor) with downlights, leaving walls, mannequins, and faces dark. The space feels cold and unwelcoming, and fails to build depth. Good retail lighting layers in wall-washing, backlit branding, and facial illumination. Without vertical light, a store lacks the warmth that makes people want to stay, as everything looks two-dimensional and cheap, no matter the budget.
2. Why does CRI fail retail lighting?
CRI measures only 8 pastel colour samples (R1–R8), completely ignoring deep red (R9), deep blue (R12), and skin tone (R13). These matter enormously in retail: R9 makes reds rich or muddy, R12 affects denim and navy, and R13 determines whether customers look healthy or sallow in fitting rooms. Two lamps can both claim CRI 90, yet one may render these colours dramatically worse – and no one measures the difference because CRI hides it. So when a maintenance team replaces a failed lamp with another “CRI 90” product, they may unknowingly degrade colour quality. The degradation is invisible on paper but deeply felt by customers.
TM-30 fixes this with two actionable metrics. Rf (Fidelity Index, 0-100) uses 99 colour samples – including saturated reds, blues, greens, and skin tones for a true picture of colour accuracy. Rg (Gamut Index, around 100) tells you whether colours appear more saturated or washed out. For retail, Rg > 100 makes products pop – vital for apparel, cosmetics, fresh food, and luxury goods. Rg < 100 makes them look dull or lifeless, even with high Rf. TM-30 gives retailers a real tool to maintain consistent, vibrant colour quality across every lamp replacement.
3. The maintenance rot – now with TM-30 precision
Back to the real-world scenario: A store opens with carefully selected lamps hitting Rf 92, Rg 108 across all zones. The reds in the handbag display are rich, the denim in the casualwear section is vibrant, the fitting room skin tones are warm and flattering.
Year one: A spotlight in the handbag section fails. Maintenance replaces it with a “CRI 90” lamp from the nearest electrical wholesaler. New lamp delivers Rf 78, Rg 94. The handbag that used to look like a $2,000 investment now looks like a $200 knock-off. The red leather has lost its depth. Nobody on the maintenance team has a spectrometer. Nobody measures TM- 30. The brand’s premium positioning takes a hit, and nobody in the corporate office knows why foot traffic or conversion rate has slipped in that bay.
Year three: This has happened across 40% of the store. The lighting is a patchwork of mismatched colour
quality. The overall experience has degraded from “luxury flagship” to “discount outlet” purely because of lamp replacements driven by a CRI specification that was never fit for purpose.
The solution for brands and designers
Specify TM-30 targets in every retail lighting brief. Minimum Rf 90, and Rg between 100 and 110 for most retail applications (closer to 105–110 for premium fashion, cosmetics, fresh food). Provide maintenance teams with an approved replacement
list that references TM-30 values, not just CRI. Make it impossible to substitute a poorly rendering lamp. Include a TM-30 compliance clause in procurement contracts – require manufacturers to deliver certified TM-30 reports per batch, not just catalogue claims. Train facilities teams that a “CRI 90” label does not guarantee consistent colour quality across the store.
This is the real third lapse: Not that lighting is static, but that the industry’s go-to metric (CRI) creates a false sense of security, allowing colour quality to silently decay through routine maintenance until the brand experience is hollowed out from within. TM-30 is the tool that fixes the blind spot – but only if it’s specified, enforced, and maintained.
About the author:
Tejas Doshi is India’s first and only Certified Lighting Designer (CLD), Asia’s second, and the world’s 17th, certified in 2016 alongside winning an IES Award. He was later named among the world’s top 40 under 40 lighting designers by Lighting Magazine, UK, and became the first Indian lighting designer to judge the Darc Awards. Today, Tejas leads Light & Beyond, where the goal is to enhance the quality of human experience through transformative lighting design.