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Retail lighting is often specified to meet a lux target at the lowest possible upfront cost. But on site, the real cost of a lighting system is reflected in how long it takes to install, how reliably it performs, and how often contractors need to return to address issues.

As energy costs rise and retailers place greater emphasis on store efficiency, lighting design is receiving closer scrutiny from engineers, contractors and procurement teams alike.

“Too often, lighting is over-specified based on rule-of-thumb spacing and nominal datasheet figures,” says Riaan Nel, Senior Key Account Manager at Rubicon. “That usually means more fittings than necessary, higher energy consumption, and higher costs for both the contractor and the retail client.”

A more efficient outcome comes from looking at the lighting installation as a complete system rather than a collection of individual fittings.

Why datasheet figures can be misleading

Nominal performance data is measured under ideal test conditions. In real installations, heat, dust, voltage fluctuations and driver losses all reduce actual output.

“Nominal figures show what the LED can do in perfect conditions,” explains Sello Leeuw, Head of Sales at Rubicon. “Effective figures reflect what the fitting will deliver once real-world losses are taken into account. Those figures give engineers and contractors a more realistic basis for planning.”

This distinction is important. If a fitting delivers less light than expected, additional fittings may be required to meet compliance requirements, adding time and cost to the project.

The metrics that have the biggest impact on lifecycle cost

According to Rubicon, three factors have the greatest influence on the total cost of owning and operating a lighting installation over its lifespan:

• Number of fittings installed
• Wattage per square metre
• Lifespan and maintenance requirements

“Fixture price is only one part of the equation,” says Nel. “The bigger savings often come from reducing fitting quantities, lowering energy consumption and minimising maintenance over the life of the installation.”

By achieving the required light levels with fewer fittings spaced further apart, contractors can reduce cabling, installation time and labour costs upfront, while also lowering the retail store’s ongoing energy consumption.

Engineering the system to do more with less

Rubicon developed its Protega Gen 2 linear LED luminaire around this principle.

By improving the optical design and reducing system losses, Protega Gen 2 increases spacing from 2.4 m to 3.0 m while maintaining the required retail lux levels.  In a recent large retail project, it also reduced lighting power density from 12 W/m² to 7.5 W/m², translating to a very significant lifetime energy saving.

Protega Gen 2 is modular and plug-and-play, with built-in safety features designed to reduce installation complexity and minimise the risk of incorrect assembly. It is engineered to be straightforward to install and maintain, without requiring highly specialised labour on site.

“In practical terms, contractors install fewer fittings, spend less time on site and have fewer potential failure points,” says Leeuw. “That translates into fewer call-backs and a simpler installation process.”

Rubicon has seen projects where reducing fitting quantities by 20% to 30%, combined with lower wattage per square metre, significantly reduce both capital and operating costs without compromising lighting quality.

Designed for easier upgrades

“Retail environments change constantly,” says Nel. “Lighting systems need to adapt without requiring a full replacement.”

Because the Protega Gen 2 luminaire is modular, internal components can be replaced without discarding the entire fitting, helping retailers reduce future maintenance costs while allowing contractors to service installations more efficiently.

For contractors, this means a lighting solution that is easier to install, reliable in operation, and designed to support long-term client satisfaction.

When a lighting system installs smoothly and performs as expected, it strengthens confidence across the supply chain and helps contractors build long-term relationships with their clients.

As Leeuw puts it: “When real-world performance, fitting count and energy efficiency are considered from the start, the installation becomes simpler and the long-term results are better for everyone involved.”

Protega Gen 2