5.1 ENEV

The requirements on the energetic quality of new-builds and modernisation of old-builds are set out in the Energy Saving Ordinance (EnEV). After several revisions since the EnEV came into force, it will be replaced in 2019 by the new Building Energy Act GEG 2019. The last version of the EnEV remains valid until this is finally ratified. The objective is to reduce energy consumption for buildings down to the low-energy standard by 2021, for public buildings already by 2019. EnEV defines DIN V 18599 (see section 5.2) as the calculation procedure for energy assessment.

5.2 DIN V 18599

In the German DIN V 18599 standard‚ energy-related evaluation of buildings calculation of used, end and primary energy requirements for heating, cooling, ventilation, hot water and lighting‘, the energy requirements for lighting is considered as a whole together with the complete energy efficiency of buildings. The buildings are zoned according to energy specifications and each zone is assigned a utilisation profile. For calculation methods, the standard defines both simple tables and detailed specialist planning.


With the introduction of the energy services act (EDL-G) energy audits in accordance with EN 16247-1 are mandatory for all commercial enterprises as of December 2015. Only small and medium-sized enterprises (SME) as well as companies with their own energy management system in accordance with ISO 50001 are exempt from this. At least 90 % of the total energy consumption is determined as part of the audit and possible potential for energy savings are highlighted. Repeat audits are required by law 4 years after the previous audit at the latest.


In order to meet increased needs for energy efficiency, lighting installations should be optimised according to energy-related factors. This applies both to the refurbishment of old systems and lighting systems to be newly installed.

The components to be analysed are:

  • Light source (in particular luminous flux)
  • Control gear (connected load, start behaviour, standby losses)
  • Lighting technology of the luminaire (light output ratio and light distribution)
  • Lighting management (lighting control, presence detection)
  • Maintenance (long service life, ease of maintenance)


According to EU Ordinance 874/2012, lamps and luminaires are classified based on their energy consumption values. On luminaires, this marking relates to the attributes of the lamps with which they can be operated. The energy efficiency class A++ has the highest level of efficiency and Class E has the lowest efficiency. The classes indicated in the catalogue relate to a piece of lighting medium equipment in light colour 840 or 830. On luminaries with replaceable lighting mediums, the efficient classes may vary depending on the light colour used.

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