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By modernising an outdated lighting system, its electricity consumption savings can reach up to 80%.

Energy-efficient lighting consumes less electricity without losing the usual level and quality of lighting. Every company needs lighting, and in some cases it makes up a significant part of the company's total electricity consumption. In companies, especially in offices, warehouses, sales places, significant energy efficiency potential can be discovered specifically in the field of lighting.

What benefits can energy efficient lighting bring to your business?

  • Reduced electricity consumption and costs.
  • Less need for maintenance, taking into account the relatively long working life.
  • Improved lighting quality, increasing employee productivity and work safety.
  • Increased employee well-being and comfort level.
  • Lighting technologies.

Lighting technologies

Lighting technologies can be divided into four groups:

  1. filament lighting – incandescent and halogen lamps;
  2. luorescent lighting – tubular and compact fluorescent lamps;
  3. metal halide lamps or high intensity gas discharge lamps;
  4. light emitting diodes, or LED lighting.

The most energy-efficient lighting solution is LED lighting – it provides the highest light output with the lowest electricity consumption.

In addition, LED lights have several advantages over other types of bulbs:

  • luminous flux does not depend on the ambient temperature;
  • light output virtually does not depend on small changes in voltage;
  • possibility to operate with light regulators;
  • frequent switching the lamp on and off does not affect its working life;
  • long working life – less frequent replacement of lamps.


Incandescent light bulb

Halogen bulb 

Tubular fluorescent lamp

Compact fluorescent lamp

Metal-halide lamp

LED lamp


8–17 lm/W

11–21 lm/W

75–95 lm/W

50–70 lm/W

~95 lm/W

80–140 lm/W

Working life







Color rendering index (Ra)

2600-2800 K or warm white

2800-3200 K or warm white

> 3200 K or warm white, white, bluish white, bluish

> 3200 K or warm white, white, bluish white, bluish

> 3200 K or warm white, white, bluish white, bluish

> 2700 K or warm white, white, bluish white, bluish

Color temperature



Yes, certain ways

Yes, certain ways



A range of LED lights

The range of LED lights available on the market is quite broad, so it is mostly possible to find an alternative solution for existing lights and needs.


When choosing a supplier of LED lamps, it is recommended to pay attention to various lamp parameters in order to choose high-quality lamps that meet your needs.

Parameters of high-quality LED lighting

1. Light flux or lumens (lm) of the LED luminaire

  • Determines how much light the lamp emits, or how brightly it shines.
  • The more lumens, the more light it emits.

2. Colour rendering index (Ra or CRI)

  • Describes the colour rendering of an object in incandescent light compared to the same colours in daylight.
  • The closer the index is to 100, the more accurate the colours in the light bulb are.
  • The colour rendering index of quality lighting is at least 80 Ra.

3. Electrical power of the luminaire (W)

  • Determines how much electricity the lamp consumes.

4. Efficiency of luminaire (lm/W)

  • Determines how efficient the luminaire is, including optical losses. Measured in lumens per watt or lm/W. The higher the value, the more efficient the luminaire. The efficiency of a high-quality luminaire starts from 130 lm/W.
  • It is essential to ensure that the luminaire documentation states the efficiency of the full configuration, i.e. the overall efficiency of the LED luminaire and not just the efficiency of the LEDs or LED modules.
  • The consumer can request additional documentation with a test report made according to EN 13032:1 and/or LM-79-08 standard.

5. Light colour temperature (K)

  • Describes the colour of the light emitted by the luminaire. It is measured in degrees Kelvin, or K. For LED lamps, the CorrelatedColour Temperature (CCT) is calculated, not measured as for incandescent lamps.
  • The higher the colour temperature of the light, the more bluish the emitted light is. It is recommended to choose luminaires with white light or at least 4000 K for work spaces, while luminaires with warm white light or around 3000 K are suitable for rest rooms.

6. Standard deviation of colour temperature (SDCM)

  • In accordance with the CIE 1964 standard, it is measured with MacAdam ellipses, evaluating colour fastness on a scale from 0 to 10.
  • Between 1 and 3, it is practically impossible to see the difference with the naked eye, but as the value increases, there can be a visible and negative effect on illuminated surfaces and objects. As the SDCM value increases, the colour temperature difference of the light also increases. Therefore, the maximum permissible SDCM has been determined for public places, for example, in museums and art galleries it must not exceed SDCM2, while in schools, offices, hospitals – no more than SDCM3.

7. Lifetime (LXBY or LXCY)

  • Determines the decrease in the luminous flux and efficiency of the LED after X hours of operation.
  • L indicates, as a percentage, how much luminous flux the luminaire will emit after the working time specified by the manufacturer. The values L70, L80, L90 are more common.
  • B indicates the number of diodes as a percentage, which will burn out after the end of the working time specified by the manufacturer or will emit a smaller amount of light than is mentioned at the L value. The values B10 and B50 are more common.
  • If a value of C is specified, it describes the percentage of the number of diodes that will completely stop working after the specified service life. In most cases, the value of C does not exceed 10% or C10. It is much lower (~1%) for standard LED modules.
  • For example, if the lamp's stated lifetime is L80B10 100,000 h, this means that after 100,000 hours of operation, 90% of the diodes will continue to emit at least 80% of the nominal light flux, while 10% of the diodes will emit a lower amount of light. If L70C5 50,000 h is indicated, it means that after 50,000 working hours, the luminaire will emit at least 70% of the nominal light flux, while 5% of the diodes will completely stop emitting light.
  • If manufacturers list only the L factor without specifying a B or C value, this may indicate a higher percentage of defective cases.

8. Uniform Glare Rating (UGR)

  • Determines the potential glare of the luminaire in a specific location (Unified Glare Rating).
  • If an LED luminaire with an excessively high luminous flux (lm) is selected, the light emitted by it, being in the field of vision of a person, may cause visual impairment, for example, by being reflected from a computer monitor.
  • The recommended maximum UGR value for office lights is 19.
  • It is possible to determine a completely accurate glare coefficient only for a physical room with a specific arrangement of luminaires and the location of the observer. However, manufacturers are obliged to perform an analysis of the intensity, reflectivity and geometry of the light emitted by the LED luminaire, so the UGR value must be indicated in the technical documentation.

Lighting electricity consumption can be reduced not only by installing modern LED lights, but also by intelligently managing and regulating them.

Lighting adjustment options

Installation of switches in zones

Installation of switches in zones: when installing luminaires, several zones (circuits) can be provided and separate switches can be installed for each zone (circuit).

Switch-lighting regulator

Switch-lighting regulator: a switch with the ability to set different lighting levels, i.e. it is possible to change the light intensity.

Motion sensors

Motion sensors: detect movement or heat (infrared) when a person is in the room and turn on the lighting.

  • If no movement is detected after a certain (set) period of time, the lighting is turned off. They can be fixed to the wall or ceiling.
  • Wall-mounted motion sensors are suitable for relatively small spaces, such as an individual office, classroom, toilet.
  • Ceiling-mounted motion sensors are suitable for larger conference rooms, open-plan offices, warehouses.
  • There are also LED lights that already have built-in sensors.

Light level sensors

Light level sensors: turn on the light at a certain ambient light level. The level at which the light is switched on is adjustable.

Time relays or timers

Time relays or timers: it is possible to set the time after which the lighting is turned off.

  • Suitable for corridors, stairwells, etc. – places where lighting is only needed for a certain time.

Adjusting the lighting system by time of day with the controller

Adjusting the lighting system by time of day with the controller: creates a lighting schedule, setting the time when the lighting is turned on and/or off.

  • Suitable for rooms and places where a constant level of illumination is required for a certain period of time. 

Lighting adjustment depending on the level of natural light

Lighting adjustment depending on the level of natural light: detects the level of natural light in the room with the help of a sensor and adjusts the level of artificial light, ensuring constant lighting.

Wireless/remote lighting control

Wireless/remote lighting control: turns lights on and off, adjusts light level and light colour with wireless switches or mobile app.

  • Luminaires are equipped with controllers that receive the transmitted signal and command the luminaire to perform the requested action.

Lighting as a service or ESKO

Lighting replacement as a service is a service-based business model where the cost of lighting replacement is spread over a fixed term and paid monthly, similar to a subscription fee, rather than a one-time payment. In this case, the replacement of the lighting, as well as the lighting during its use, is managed by an outsourcing service – specialised service providers who perform design, financing, installation, maintenance and other services depending on the agreement.

Ownership rights of lights and equipment remain with the lighting service provider for the entire duration of the subscription or contract. Such a business model makes it possible to extend the lifetime of the luminaires.



  • No large initial investments are required.
  • The service is provided by industry experts.
  • The service provider is responsible for monitoring and maintaining the lighting system, i.e. replacement, compliance with the requirements of new laws and regulations and recycling of lamps.
  • During the term of the contract, the ownership of the fixtures and equipment belongs to the service provider.
  • The customer is bound to the service provider for the entire duration of the contract.

How to start replacing an existing lighting system?

1. The company's needs for lighting and the existing situation should be analysed. Analysis of the current situation includes:

  • electricity consumption and operating costs of the lighting system;
  • lighting working hours;
  • places of use and needs of lighting;
  • lighting levels and their quality;
  • control elements and sensors for lighting regulation;
  • the level of natural lighting;
  • behavioural habits of personnel/employees.

2. The obtained information should be used to evaluate the possibility of reducing the number of luminaires, replacing luminaires, installing sensors and control elements or to change behaviour habits.

3. Requirements and costs for lighting replacement and retrofitting should be determined.

4. It should be determined whether it is necessary to attract additional specialists/outsourcing. Specialists will be able to plan the luminaires in such a way that the required level of illumination is provided in the specific workplaces and areas.

5. Price offers should be obtained and suppliers' offers should be carefully evaluated.

We also invite you to take a look at Cabinet Regulation No. 359 “Labour Protection Requirements in Workplaces” in Appendix 2, where information is available on the minimum indoor lighting level depending on the workplace and type of work.

Excerpt from Regulation No. 359 in Appendix 2


Workplace or type of work

Em - minimum level of lighting above the work area (lx - luxes)


Warehouses, including coldstores



Workplaces and areas for preparation of raw materials: breweries, malt production, barrel filling, boiling, sifting, washing and skinning of products



Offices: reading, writing, typewriting, data processing


Experience in lighting replacement

Experience story about lighting for productive work in the Schneider Electric office

The experience of the city of Liepāja in smart lighting solutions

Take a look at the "Publications" and "Seminar archive" sections of the Elektrum homepage to get additional information about lighting replacement, its quality requirements, control options, and to learn about the experience of other companies in lighting replacement.

Have any additional questions? Ask here!