Fachverband Licht
Leitfaden
Planungssicherheit
in der LED-Beleuchtung
Begriffe, Definitionen und Messverfahren:
Grundlagen für Vergleichbarkeit
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 electrical power
consumed by the luminaire.
The value is expressed in lumen per watt (lm/W).
The International Electrotechnical Commission (IEC) is currently drawing up IEC and EN standards
for the assessment and comparability of technical parameters issued for LED luminaires. In this
regard, the Lighting Division of the German Electrical and Electronic Manufacturers Association (ZVEI)
published its Guide to Reliable Planning with LED Lighting.
The terms and explanations used in this catalogue and in our 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.
Technical parameters of LED luminaires
ZVEI Guide
Guide to Reliable
Planning with LED
Lighting
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