El Corte Inglés Madrid: CRI95+ Custom LED Retail Lighting Solution

Introduction — the on-site problem

At XHLWX (led-project-light.com), a Custom Indoor LED Lighting Manufacturer based in China, we were approached with a significant challenge by one of Europe's most prestigious retail destinations: the El Corte Inglés flagship store on Paseo de la Castellana, Madrid. The project's focus was the complete relighting of their high-fashion floors, home to world-renowned luxury brands. The existing installation, composed of outdated halogen and early-generation metal halide track lights, suffered from multiple critical flaws. Firstly, the color rendering was poor (CRI < 80), which distorted the true hues of expensive textiles and leather goods, undermining brand integrity and customer confidence. Secondly, the fixtures produced excessive glare (UGR > 22), creating a visually uncomfortable shopping environment. Thirdly, the energy consumption and heat output were enormous, leading to high operational costs and straining the store's HVAC systems. The mandate was clear: develop a bespoke LED lighting solution that would deliver museum-quality light, exceptional visual comfort, and dramatic energy efficiency, all while integrating seamlessly into the store's sophisticated aesthetic.

What "custom" meant on this project — capability matrix

For El Corte Inglés, "off-the-shelf" was not an option. The solution demanded a luminaire engineered from the ground up to meet a precise set of performance criteria. Our team collaborated closely with the client's architects and visual merchandising department to define and deliver on these specifications. The result was the XHLWX-TR97, a custom track luminaire tailored for high-end retail. The key parameters were defined in a rigorous capability matrix, ensuring every fixture met the project's exacting standards.

Parameter	Specification	Standard / Method	Notes
Color Rendering	CRI Ra > 97, R9 > 90	TM-30-18	Bridgelux Thrive™ V13 COB selected for its solar-spectrum mimicry, crucial for rendering reds.
Correlated Color Temp.	3000K (Warm White)	ANSI C78.377	Held to a 2-step MacAdam ellipse for fixture-to-fixture color consistency across the floor.
Glare Control	UGR < 16	EN 12464-1	Achieved via a custom 45mm deep, black specular "darklight" reflector optic.
Beam Angles	15°, 24°, 38°	IESNA LM-79	Field-interchangeable optics to adapt lighting for various display types (spot vs. flood).
Control Protocol	DALI-2 Device Type 8	IEC 62386-209	Enables individual addressing, grouping, scene recall, and color tuning for future-proofing.
Driver	Tridonic LCI 35W	-	Premium driver ensuring flicker-free dimming down to 1% and high power factor (>0.95).
Housing & Mounting	Die-cast Aluminum, IP20	-	Custom RAL 9016 powder coat finish; designed for existing 3-circuit track infrastructure.
Certifications	CE, RoHS, ENEC	-	Full compliance for the European Union market, including ISO9001 quality management.

Engineering solutions

Transforming the fashion floor required more than just a high-spec product; it demanded innovative solutions to complex on-site challenges. Our engineering process was divided into three core areas of focus.

How did we achieve museum-quality color rendering (CRI 97+) for luxury textiles?

The primary objective was to make the clothing and accessories look as true to life as possible. Standard high-CRI LEDs often fall short in rendering deep, saturated reds (the R9 value). For fashion, this is unacceptable. Our solution was to build our custom module around the Bridgelux Thrive™ V13 COB. Unlike conventional LEDs that use a blue pump with phosphors that create peaks and troughs in the spectrum, Thrive technology is engineered to mimic the smooth, continuous spectrum of natural sunlight. This resulted in an exceptionally high CRI of 97 and, critically, an R9 value consistently measured above 90. This ensures that a deep burgundy dress or a vibrant red handbag is perceived by the customer with absolute color fidelity, eliminating the risk of product returns due to color discrepancies.

What was the strategy for reducing visual glare to UGR<16 across the sales floor?

High illuminance levels are necessary in retail to make merchandise "pop," but this often comes at the cost of visual comfort. Shoppers looking up would be met with distracting and uncomfortable brightness from the old fixtures. To combat this, we designed a bespoke optical system. The core of this was a deep-baffled reflector, precision-molded and finished in a black specular coating. This "darklight" design recesses the COB light source 45mm from the fixture aperture. The geometry is calculated to cut off light above a 65-degree viewing angle, meaning shoppers walking the aisles are shielded from the direct light source. The beam is shaped with extreme precision onto the vertical and horizontal displays, creating a dramatic, high-contrast effect where the merchandise is brilliantly lit, but the ceiling and light sources remain unobtrusively dark. This meticulous glare control resulted in a Unified Glare Rating (UGR) below 16, a level typically reserved for demanding office environments, but here applied to create a premium retail experience.

How was a DALI-2 control system integrated for dynamic scene setting and energy savings?

A static lighting plan was insufficient for a dynamic retail space. El Corte Inglés required the ability to adapt the ambiance for sales events, new collection launches, or even time of day. We integrated a full DALI-2 control system, connecting over 1,200 individual track spots to a central controller. By using DALI-2 (IEC 62386) over simpler 0-10V or phase-dimming systems, each luminaire becomes an individually addressable digital node. This granular control allowed us to program specific "scenes": a bright, energetic 'Day' scene (100% output), a softer 'Evening' scene (70% output), and a 'Promotional' scene that highlights specific displays at 120% (for short durations, as enabled by the driver's power reserve). Furthermore, the system was integrated with photosensors for daylight harvesting, automatically dimming fixtures near the large exterior windows to save energy. This intelligent control provides both creative flexibility and a powerful tool for operational efficiency.

Project results — measured

Following the commissioning of all 1,200+ custom track lights, a third-party lighting auditor was brought in to validate the performance against the project goals. The results exceeded expectations.

• Illuminance Levels: Achieved a consistent average of 1250 lux on vertical displays (mannequins, wall racks) and 800 lux on horizontal surfaces (tables, counters), meeting the high-contrast targets set by the visual merchandising team.
• Color Quality: Post-installation spectral measurements confirmed an average CRI of Ra 97.2 and an average R9 (saturated red) value of 92, ensuring world-class color fidelity across all merchandise.
• Glare Control: On-site measurements taken from multiple positions across the sales floor confirmed an average UGR of 15.8, vastly improving on the previous installation's UGR >22 and creating a comfortable, premium browsing experience.
• Energy Efficiency: The total connected lighting load was reduced from 210 kW to just 58 kW. Combined with DALI-2 control strategies (scheduling and daylight harvesting), this led to a verified 72% reduction in annual lighting energy consumption. This translates to an estimated saving of over 150,000 kWh per year.
• Financials: Based on the energy savings and a significant reduction in maintenance (from a 1-year halogen replacement cycle to a 50,000-hour rated LED life), the project's capital expenditure payback period was calculated to be just 28 months.

Photometric files & compliance (IES / LDT / DIALux / CE / RoHS)

A cornerstone of our engineering process is meticulous planning and verification. Before a single fixture was manufactured, our lighting design team created a complete 3D model of the retail floor in DIALux EVO. This simulation allowed us to predict illuminance levels, uniformity, and glare with high accuracy. The simulation was powered by proprietary photometric data, which we generate in our in-house goniophotometer lab. For this project, we provided the client and their architectural partners with complete IES and LDT photometric files for each of the three interchangeable beam angles (15°, 24°, 38°). This transparency ensures that the specified performance is scientifically verifiable and repeatable. All manufactured components, from the Tridonic driver to the finished luminaire, are fully certified with CE, ENEC, and RoHS compliance, guaranteeing safety and market access for the European Union.

Frequently Asked Questions

Q: Why was CRI 95+ so important for this project?

A: A CRI of 97+ with an R9 value over 90 ensures that the true colors of luxury fabrics, from vibrant silks to subtle cashmeres, are rendered with exceptional accuracy. This directly impacts customer perception and purchasing confidence, as the merchandise looks the same in-store as it does in natural daylight. It prevents the color distortion that is common with lower-CRI lighting.

Q: What is the benefit of a DALI-2 control system over a standard 0-10V?

A: DALI-2 offers individual digital addressability for each of the 1,200+ fixtures installed. Unlike group-based 0-10V systems, this allows for precise scene creation, individual dimming, and advanced energy management strategies like daylight harvesting. It also provides feedback on lamp/driver status, simplifying maintenance and reducing long-term operational costs significantly.

Q: How was a UGR of less than 16 achieved with such high light levels?

A: We achieved a UGR < 16 by engineering a custom luminaire with a deep-baffled, black specular reflector. This optic design shields the Bridgelux COB light source from typical viewing angles (above 65 degrees), directing light only where needed on the merchandise. This creates high contrast and visual comfort, even with vertical illuminance exceeding 1200 lux.

Q: Are the photometric files for this custom fixture available?

A: Yes, we provide comprehensive photometric data for all custom products. For the El Corte Inglés project, complete IES and LDT photometric files were generated and used in the DIALux simulation to guarantee performance. These files are available to architectural and lighting design partners upon request for their own project specifications, ensuring predictable and repeatable results.

Request a custom quote

This project is a testament to the power of bespoke lighting design in transforming a retail environment. At XHLWX (led-project-light.com), a Custom Indoor LED Lighting Manufacturer based in China, we thrive on collaborating with clients to solve their most difficult lighting challenges. From high-CRI retail to low-glare commercial spaces, our team of engineers and designers is ready to build the perfect solution for your project. Contact us today to discuss your requirements and request a custom quote.