How to choose the most appropriate light bulb for home?

We encourage you to use energy-efficient, economical and environmentally-friendly lighting.

The main criteria for light bulbs are the energy efficiency class and the luminous flux – how bright the bulb shines.

It is advisable to use energy-efficient light bulbs primarily in those rooms where the artificial lighting is planned to be used for the longest time. This means that replacement of the bulbs in such rooms will pay off the quickest!

Types of bulbs

Halogen bulbs



These bulbs are 30% more economical than their predecessors, incandescent bulbs.


Their service life is up to 2,000 hours, whereas incandescent bulbs last only up to 1,000 hours.

Compact fluorescent bulbs


These bulbs are also called economical or energy-efficient light bulbs, and they consume 75 to 80% less electricity compared to incandescent bulbs.


Their service life is 6 to 15 times longer, that is from 6,000 up to 15,000 hours.

Light-emitting diode (LED) bulbs


The most efficient bulbs, as they offer 85 to 90% of electricity savings compared to incandescent bulbs, with a service life of 15 to 25 times longer.


LED bulbs last from 15,000 to 25,000 hours.

Explore the pictograms on the bulb package to choose the most suitable light bulb for your home!



Light bulb pictograms

1. Energy efficiency labels


A++ is the highest energy efficiency class, while E is the lowest.


The A++ class bulb has the longest service life and the lowest power consumption.


The power consumption of the bulb in kilowatt hours (kWh) for 1,000 hours is indicated on the bottom of the label.

2. Luminous flux


The luminosity of a light bulb is characterised by the luminous flux, with the lumen (lm) as the unit of measurement. The higher the lumen, the brighter the bulb shines.


For example, a 60 W incandescent bulb can be replaced with a 702 lm halogen bulb, a 741 lm compact fluorescent bulb or a 806 lm LED bulb, but the light that is perceived by the human eye will be the same.

3. Power


The unit of power of the bulb is watts (W).


To calculate the daily, monthly or annual electricity consumption of a bulb in kilowatt-hours (kWh), the power (W) must be divided by 1,000 and multiplied by the bulb’s service life in hours (h).

4. Colour temperature


The colour temperature of light bulbs is measured in degrees Kelvin and designated by K. The lower the degrees Kelvin, the more yellow the light, whereas the higher the degrees Kelvin, the more blueish the light.


The light emitted by bulbs tends to be different: yellow, white or bluish. The warm white light is in the range from 2,700 to 3,200 K, white light – from 3,200 to 4,000 K, bluish white light is more than 4,000 K and bluish light is over 6 000 K.


More yellow light is advisable for living space, while white light is suitable for workrooms and corridors.

5. Colour rendering index


The colour rendering index is designated by Ra and it represents the colour rendering of the object in the light of the bulb compared to the same colours in the daylight.


The closer Ra is to 100, the more precise the object’s colour in the light of the bulb.

6. Number of switching cycles


In places where lighting has to be switched on or off frequently, bulbs with more switching cycles should be used.


6,000 switching cycles are most commonly indicated of the packaging of compact fluorescent bulbs, while LED bulbs have from 20,000 to 200,000 cycles.

7. Service life


The bulb’s service life forecast by the manufacturer is given in hours (h); however, at least 50% of bulbs also operate after exceeding the specified time.

8. Warm-up time


This indicates the time in which the bulb will reach a 100% light output – whether it will happen gradually or with a delay of 1 second, or in any other time unit.

9. Bulb and bulb socket size

When purchasing a new bulb, pay attention to the bulb socket type, bulb size and light emitting angle. Therefore, it is recommended to take a burnt out bulb with you to the shop.

Operating temperature

For outdoor lighting, use bulbs designed for a wide range of temperatures, for example from -20 °C to + 40 °C.


Since both 230 V and 12 V voltage is used for lighting, it is necessary to check the voltage of the grid before buying the bulb.

Light intensity control

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If it is possible to adjust the lighting intensity in the room, choose bulbs that can be operated with lighting regulators or dimmers.


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Unfortunately, the production of compact fluorescent lamps requires the use of mercury; however, its content in quality bulbs is very small – less than 1.5 milligrams.

Bulb disposal


Burnt out LED bulbs and compact fluorescent bulbs may not be disposed of in household waste; they must be disposed of at bulb collection points.


Bins for collecting burnt out bulbs can be found in the premises of the Energy Efficiency Centre.

Have any additional questions? Ask here!

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