Lighting modernization in a company – when is it worth upgrading existing LED lighting too?

If a facility replaced fluorescent or discharge lamps with LEDs several or even more than ten years ago, that does not mean lighting is a settled issue. Increasingly, investment decisions now concern installations that already use LED technology. The question is not “are newer luminaires available?” but rather “does the current system still match how the facility operates, and is redesigning it economically justified?”

A secondary LED → LED upgrade can make very good sense, but it should not be automatic. The fact that a new luminaire draws fewer watts is not enough. The actual lighting effect in individual zones, luminaire layout and optics, operating hours, failure rates, control options, environmental conditions and the maintenance cost of the entire installation all need to be considered.

In short: functioning LED luminaires are not automatically “due for replacement”. Modernization makes sense when a specific option improves the balance of energy use, lighting quality and operating costs. Sometimes that means replacing luminaires; in other cases, changing their layout, optics, zoning or controls delivers a greater benefit.

LED lighting modernization is no longer just about replacing old light sources with LEDs

The first wave of modernization in many facilities primarily involved replacing fluorescent, metal-halide or sodium lamps with LED luminaires. In some projects, the existing number of light points, their positions and the control method were retained. That was often a natural step because the technological difference between the old light sources and LEDs was substantial.

Today, a different case is becoming increasingly common: a production hall, warehouse or service facility already has LED lighting, but the installation has been operating for many years, the production layout has changed, racks, machines or new workstations have appeared, some luminaires have started failing more frequently, while the controls still operate in an “entire hall on or off” mode. This is the market for secondary LED → LED modernization.

There is no universal age at which LEDs should be replaced. In practice, the decision should be based on data about system performance. The PN-EN 12464-1:2022-01 standard specifies quantitative and qualitative requirements for lighting of indoor workplaces, but it does not prescribe a single technical solution. This distinction matters: the objective is to provide the right lighting conditions for a specific function, not to install the “latest” luminaire.

When does an existing LED installation qualify for modernization?

Detailed methodology for measurements, inventory and condition assessment belongs in a lighting audit. At the modernization decision stage, the results of that assessment are used to answer a different question: what exactly is worth changing, and does the benefit justify the expenditure?

1. Illuminance and uniformity must be assessed against the actual function of the zone

Two locations in the same hall can have completely different needs. A traffic route is assessed differently from a picking zone, and a quality-control workstation differently again. If the entire facility was treated identically during the first modernization, years later some zones may turn out to be overdesigned while others are underlit.

This is why modernization should not start with the question “how many watts should the new luminaire have?” First determine the function of the area and the required lighting performance. Only then should the layout, light distribution, luminous flux and control method be selected.

2. A decline in lighting performance does not always mean the entire system must be replaced

LEDs also change over time. The IEC 62722-2-1:2023 standard specifies performance requirements for LED luminaires and test methods. From the user’s perspective, however, what matters is not only what was declared for a new luminaire, but also what the installation actually delivers after years of operation.

Before deciding on replacement, it is worth separating three effects: natural degradation of the light source, contamination of luminaires and surfaces, and local damage. If the main problem is dirt or a faulty part of the installation, full modernization may not be economically justified. If, however, lighting performance has deteriorated across the system and failure rates are also increasing, modernization can provide benefits from two sources: energy and maintenance.

3. Failure rates can be just as important as energy consumption

In a high-bay hall, the cost of a failure does not end with the price of the luminaire or driver. Access arrangements, a lift, shutting down part of a zone, maintenance staff time and the risk of further interventions all add cost. If an installation is energy-efficient but requires increasingly frequent servicing, an LED → LED decision may be justified precisely by operating costs.

On the other hand, isolated failures in a system that is only a few years old are not yet a reason to replace hundreds of functioning luminaires. In such a case, a partial-replacement plan and a stock of compatible spare components may be more reasonable.

Why is a comparison based only on W/luminaire insufficient?

This is one of the most common mistakes when comparing offers. The old luminaire is 150 W and the new one 90 W, so the rated power of a single luminaire is 40% lower. This does not automatically mean 40% energy savings for the entire installation. That conclusion can only be drawn after accounting for the number of luminaires, operating time and operating mode, and after confirming that the option provides the required lighting performance throughout the space.

A lower-power luminaire may have different optics. It may require more light points. At high mounting heights, it may direct too much light outside the work area. Conversely, a higher-power luminaire with the correct light distribution may make it possible to reduce the number of points or operate at reduced output. At investment level, therefore, the entire option must be compared: number of luminaires, total power, light distribution, actual operating profile, controls and maintenance.

The same applies to luminous efficacy expressed in lm/W. It is an important product parameter, but it is not a measure of the quality of the entire installation. EU ecodesign requirements cover, among other things, light sources and separate control gear (Commission Regulation (EU) 2019/2020), while the lighting design must still be appropriate for the specific space and visual task.

Practical rule: do not compare an “old luminaire” with a “new luminaire”. Compare the current option with the modernization option at the level of the entire zone or facility.

Model example: why the number of light points and controls change the result

For illustration only, assume that the existing installation has 100 luminaires rated at 120 W and operates 4000 hours per year. Its modelled energy consumption is then 48 MWh/year.

This is not an Energy Trend project example or a forecast for a specific facility. It only illustrates the calculation mechanism: power, number of light points and operating profile all affect the result. An option with fewer luminaires or reduced operating time/output can only be considered if lighting calculations and subsequent measurements confirm the required performance in every analysed zone.

Simple luminaire replacement versus genuine modernization of the lighting system

A 1:1 replacement is not inherently wrong. If the light-point layout is good, the optics suit the space, the controls are adequate and the main issue is worn luminaires, this option may be the least expensive and most rational. The problem arises when a layout from years ago is copied without reflection even though conditions have changed.

When do layout, optics or controls deliver a greater benefit than LED replacement alone?

High-bay halls

In high-bay halls, it is easy to focus on powerful high-bay luminaires and their efficacy. In practice, however, the result is often determined by mounting height, beam width, obstructions, overhead cranes, roof structure and the actual location of workstations. If light is directed into unused areas, simply replacing luminaires with more efficient ones may only reproduce the error of the previous design.

Maintenance should also be taken into account. The more difficult the access, the greater the importance of reliability and predictable maintenance—not just minimum installed power.

Warehouses

The same light distribution will not necessarily work well in both an open warehouse and a warehouse with high racking. In aisles, light needs to be directed where the work and storage areas actually are, rather than above the racks. At the same time, many warehouse zones are used intermittently, so the potential may lie in occupancy-based control or division into smaller zones.

If digital controls are to be added to the installation, the DALI family is one established standard; general requirements for system components are set out in IEC 62386-101:2022. Choosing a protocol alone does not determine the savings, however—a sensible zoning strategy and operating scenario are needed first.

Production

In production areas, lighting should match the current process. Moving a line, adding a machine, changing quality-control activities or creating new workstations can make the old luminaire layout illogical. In such cases, LED → LED modernization should start with a map of functions and zones, not with a luminaire catalogue.

A mixed option is often more sensible: some existing luminaires remain, optics or positions are changed in selected locations, and different supplementary lighting is used where the task requires greater precision. This approach limits replacement of functioning components simply because “a modernization is being carried out”.

Cold stores and other demanding environments

In a cold store, freezer, dusty hall or facility with intensive wash-down, environmental conditions may matter more than a difference of a few watts. The permissible operating-temperature range of the luminaire and driver, enclosure resistance, sealing method, materials and service conditions must be checked. The IP code is defined in IEC 60529, but an IP rating alone says nothing about the performance of a specific luminaire at a given temperature or in a particular chemical environment.

In demanding conditions, the data for the specific solution and the required degree of protection must therefore be verified for the application; the IP classification itself is described in IEC 60529. Hazardous areas with explosive atmospheres are subject to separate requirements, and simple conclusions from a typical production hall should not be transferred to them.

LED → LED: when does modernization make economic sense?

The best reference point is not “old technology versus new technology”, but several realistic options for the same facility. For an installation that already uses LEDs, at least four alternatives should be compared:

1. keep the existing installation and perform only the necessary servicing;
2. optimize without full replacement—for example by changing schedules, zones or settings, or adding controls;
3. partial modernization—replace selected luminaires, drivers or groups with the greatest potential;
4. system modernization—a new arrangement of light points, optics and controls, potentially including full luminaire replacement.

For each option, compare capital expenditure, total energy consumption under the actual operating profile, servicing and accessibility costs, expected service life and technical risks. Where controls are used, a simple “power × number of hours” model is not enough if the dimming level changes during the day or some zones are switched off.

When is keeping the existing LED installation the best decision?

New technology is not an end in itself. If measurements confirm appropriate lighting levels and uniformity, the installation is reliable, properly divided into zones, has a sensible operating profile, and the difference in energy consumption between the current and new options is small, replacing functioning luminaires may not make economic sense.

• there are no significant problems with illuminance, uniformity or glare in the analysed zones;
• there is no trend of increasing failure rates;
• the light-point layout still matches the current organization of the hall;
• the controls limit lighting operation where justified;
• operating hours are low or the energy savings after modernization would be small;
• the cost of full replacement is high relative to the savings and additional benefits.

In such a situation, cleaning, inspection, replacement of individual damaged components, schedule adjustments or modernization of only one zone may be the better action. A sound analysis should allow for the option “do not modernize now”.

How to modernize lighting in a company—a practical process

1. Define the investment objective. Is the issue energy use, failures, insufficient lighting, lack of controls, a process change, or several of these factors at once?
2. Build a reliable baseline. If data are missing, carry out a lighting audit: inventory, measurements, and analysis of operating hours and controls. The audit answers the question “how does the current installation operate?”
3. Divide the facility into functional zones. Do not treat the entire hall as one area with a single parameter if different areas have different tasks and operating hours.
4. Prepare several options. Alongside full replacement, include an option to keep the installation, a controls option and—where justified—a partial modernization option.
5. Perform lighting calculations for the options. Compare not only power, but also light distribution, uniformity, number of light points and compliance with the requirements for the specific function.
6. Verify technical and environmental parameters. Check the luminaire, driver, optics, operating temperature, enclosure protection, control compatibility, servicing and warranty conditions.
7. Compare economics at system level. Include energy, servicing, access, spare parts and the cost of implementing controls—not just the purchase price of luminaires.
8. After implementation, carry out acceptance checks and measurements. Verify that the installation actually meets the design assumptions and that the control scenarios operate as planned.

For larger or unusual facilities, it may be worth piloting the solution in one representative zone. This makes it possible to verify not only measurement results, but also control behaviour, user comfort and maintenance practice before rolling the solution out across the entire facility.

Is lighting replacement a repair or a modernization?

In the technical language used in this article, modernization means a change that improves the parameters or operation of the lighting system. This does not automatically determine its tax, accounting or classification under construction law. Whether a specific scope of work is treated in a particular case as a “repair”, “modernization”, “improvement” or restoration of a fixed asset depends on the purpose of the classification and the investment documentation.

For a 1:1 replacement, two questions should therefore be separated. Technically: are we only replacing worn components, or are we changing the system’s parameters and functionality? Formally: how should this specific scope be classified for accounting, tax, construction-law or funding-programme purposes? The second question should not be decided solely on the basis of the power rating of the new luminaires.

Polish white certificates and financing—check them before starting the investment

Modernization or replacement of lighting is expressly listed in Article 19(1)(3)(a) of Poland’s Energy Efficiency Act as an energy-efficiency improvement measure. The current consolidated text of the Act was published in the Polish Journal of Laws as Dz.U. 2025 poz. 711. Article 20 states, among other things, that an energy efficiency certificate is not available for a measure or measures of the same type where the resulting energy savings are less than 10 toe on average per year. The application is submitted by the entity planning to commence the works or by an entity authorized by it.

The statutory definition of “commencement of works” is crucial to the sequence of actions. It includes the start of construction works connected with the energy-efficiency improvement measure, the first legally binding commitment to order equipment used to improve energy efficiency, or another commitment that makes the measure irreversible—whichever occurs first. The Act provides for refusal to forward information on an issued certificate to the entity maintaining the register if the works commenced before the application was filed. The possibility of using Poland’s white certificate system must therefore be checked before such a commitment arises, not only at the implementation stage. The basis is the Polish Energy Efficiency Act—Dz.U. 2025 poz. 711 and the current materials of the Polish Energy Regulatory Office (URE) concerning applications for energy efficiency certificates.

This means that financing should be considered early in the process, but it should not replace the technical decision. First, there must be a justified modernization option and a credible energy-saving effect. The detailed formal route should always be checked against the current materials of the Polish Energy Regulatory Office (URE) and the legislation in force in Poland.

What about street and outdoor lighting modernization?

The main scope of this article is production halls, warehouses, manufacturing and business facilities, but the principle of a system-based approach also applies to outdoor lighting. Requirements for indoor spaces cannot, however, be transferred directly to outdoor areas or roads.

For outdoor workplaces, the current PN-EN 12464-2:2025-04 specifies quantitative and qualitative requirements appropriate to such spaces. Street lighting is a separate design topic. Modernization still requires analysis of geometry, light-point layout, optics, controls and the actual operating profile, but the criteria must be selected for the specific function of the area.

Lighting audit versus lighting modernization—where is the boundary?

These two topics are related, but they answer different questions. A lighting audit determines the condition of the installation: the luminaires, power ratings, operating hours, measurement results, zones, controls and potential problems. This article starts one step later: with that picture available, the task is to decide whether to modernize, which option to choose and how far the system redesign should go.

There is therefore no need to duplicate the entire audit methodology in material about modernization. In practice, the two stages should connect: a good diagnosis prevents functioning components from being replaced without reason, while a well-designed modernization turns the diagnosis into a specific investment option.

The most common mistakes when modernizing existing LED lighting

• comparing offers solely on the basis of W/luminaire or unit price;
• assuming that all existing light points must remain in exactly the same locations;
• failing to divide the hall into zones with different functions and operating hours;
• ignoring changes in the layout of racks, machines and workstations since the previous modernization;
• failing to account for servicing costs, especially in high-bay and hard-to-access halls;
• selecting controls without checking the actual occupancy and daylight profile;
• treating high lm/W efficacy as proof that the entire design will be more efficient;
• replacing all luminaires even though the problem concerns only a few zones or the controls themselves.

FAQ—LED lighting modernization in a company

Is it worth replacing functioning LED luminaires with newer LEDs?

Yes, but only when the benefit comes from the option as a whole—for example lower energy consumption, better light distribution, fewer failures or improved control capability—and justifies the investment cost. The mere fact that a newer generation of luminaires is available is not sufficient reason.

Does a lower power rating for a new luminaire always mean savings?

No. You need to check how many luminaires will be required, what distribution and lighting level they will achieve, and how they will be controlled. The comparison must cover the entire zone or installation, not a single luminaire.

Does modernization have to cover the entire hall?

No. In many facilities, a partial option is rational: retain good luminaires, redesign selected zones, change optics, add controls, or replace only groups with high failure rates.

Do occupancy sensors always pay back?

No. They make the most sense where the zone’s actual use profile includes periods of reduced demand for light. In continuously occupied zones, an occupancy sensor may deliver little benefit; the real operating profile is what matters.

After how many years should LED lighting be modernized?

There is no single age threshold. The decision should be based on measurement results, lighting quality, failure rates, the condition of luminaires and drivers, how the facility is used, control possibilities and the economics of the specific option.

Conclusions: system first, luminaire second

The best lighting modernization does not have to mean replacing the largest possible number of devices. In a facility that already has LED lighting, the greatest potential may come from better light distribution, changing light points, zone-based control or eliminating operational problems. In another case, full LED → LED modernization will be justified. In yet another, the best option will be to leave the existing installation in place.

Before preparing a request for quotation, it is therefore worth separating two stages. First assess the installation in a lighting audit, and only then decide on the modernization option. This helps avoid apparent savings based solely on comparing luminaire power and keeps the focus on what really changes energy consumption, lighting quality and facility maintenance costs.

Sources and technical basis

• PKN: PN-EN 12464-1:2022-01—Lighting of indoor workplaces
• IEC: IEC 62722-2-1:2023—performance requirements for LED luminaires
• EUR-Lex: Commission Regulation (EU) 2019/2020—ecodesign for light sources and separate control gear
• IEC: IEC 60529—degrees of protection provided by enclosures (IP Code)
• PKN: PN-EN 12464-2:2025-04—outdoor workplaces
• ELI: Polish Energy Efficiency Act—consolidated text, Dz.U. 2025 poz. 711
• Polish Energy Regulatory Office (URE): application for an energy efficiency certificate