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Although the energy consumption of lighting can vary significantly depending on the type of bulb used, it is estimated that its represents 9% of a households total energy.

Type of bulbs


  • Incandescent bulbs – Older technology, which is cheaper but does not last as long. The yield of these bulbs is very low: about 5% of the energy consumed is made use of as light, whilst the rest is released as heat. This fact led the European Union to recall them from the market.
  • Halogen bulb– Their yield is greater to that of the incandescent bulbs and they take up less space for the same voltage. They last slightly longer, and are a little more expensive, than incandescent bulbs. Bulbs that consume up to 40% less energy, yet which still provide the same quantity of light, are already becoming available on the market.
  • Fluorescent tube lights– As a general rule, they consume 80% less than the incandescent bulbs and general far less heat. They last between 6 and 20 times longer than incandescent bulbs. They do take some time to reach their maximum brightness and are negatively affected by the number of times they are turned on.
  • Energy-saving bulbs – For the same level of light, you save up to 80% of the energy and they last up to 8 times longer than incandescent bulbs.
  • Light-emitting diodes (LED) – Some of the main advantages are low energy consumption, greater working life, reduced size, long lasting and resistant to vibrations. In addition to this, they reduce the amount of heat given out and do not contain mercury, which is beneficial to the environment. They are, however, more expensive.



  • If the light is turned on for a long time, as can happen in the kitchen, the best bulbs to use are the fluorescent.
  • If the light is going to be turned on for a short time, as is the case with corridors or bathrooms, then the bulbs that would be best to use are the low, energy consuming halogens.
  • Gradually replace the incandescent bulbs that you still have with energy-saving ones. Consider changing your halogen bulbs for LEDs.