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Technical parameters of LED luminaires

The International Electrotechnical Commission (IEC) has drawn up standards for the method of operation of LED luminaires and LED modules. These standards define quality criteria and generally valid measurement requirements for their comparative assessment. In this regards, the Lighting Division of the German Electrical and Electronic Manufacturers’ Association (ZVEI) published the second edition of its “Guide to Reliable Planning with LED Lighting” in November 2015.

The terms and explanations used on this website and in our catalogues, data sheets and instructions for use are based on this ZVEI publication.

The most important parameters are described below. Sometimes, we use other terms where they improve understanding. The corresponding terms used in the “Guide to Reliable Planning with LED Lighting” are then placed in brackets.

  • Module luminous flux (nominal value)

    The luminous flux (Φ) of an LED module measured in lumen (lm).
    This value defines the luminous flux which is created by an LED module at an ambient temperature of 25 °C.

  • Luminaire luminous flux (ZVEI rated luminous flux)

    The luminous flux (Φ) of a luminaire measured in lumen (lm).
    This value defines the total luminous flux which is emitted by the luminaire.

  • Module connected wattage (nominal value)

    The connected wattage (P) of an LED module measured in watts (W).
    This value defines the power which is consumed by an LED module.

  • Luminaire connected wattage (ZVEI rated input power)

    The connected wattage (P) of a luminaire measured in watts (W). This value defines the total power which the luminaire consumes after thermal stabilisation.
    This value covers all the installed components, e. g. LED module and operating device.

  • Luminaire luminous efficiency

    The luminaire luminous efficiency is the quotient of the emitted luminous flux and the electric power consumedby the luminaire. The value is expressed in lumen per watt (lm/W).

  • Colour temperature

    The term “colour temperature” is used for the light colour of white light. It is expressed in Kelvin (K).
    The term warm white is used up to 3,300 K, neutral white from 3,300 K to 5,300 K, and daylight white over 5,300 K.

  • Colour rendering index

    The colour rendering index (Ra) stands for the degree of conformity between the perceived colour of an object and its appearance under a specific light source.

  • Ambient temperature (ZVEI rated ambient temperature)

    The ambient temperature (ta) defines the maximum temperature, measured in degrees Celsius (°C), at which a luminaire is allowed to be operated.

  • Service life criteria

    Most LED do not fail by a certain time but their luminous flux decreases over time (degradation). The service life of LED, LED modules and luminaires is limited accordingly by the total failure of their related electronic components (e. g. power supply units) or by the luminous flux dropping below a previously fixed minimum value.

  • Voltage

    The maximum electric rated voltage, measured in volts (V), at which a luminaire is allowed to be operated.

  • Module designation

    Unlike conventional lamps, for which there are clearly defined connection standards, LED are a fixed part of luminaires. It is difficult therefore for non-specialists to obtain matching LED replacement modules. As a responsible manufacturer, we have come up with a solution to this problem for our customers. Today you will already find a lamp designation in every LED luminaire, providing exact details of the installed modules. Furthermore, our in-house production will enable us to deliver matching LED modules for many years to come.