lumen
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lumen
The physical unit for luminous flux, which indicates how much visible light a light source emits in total per unit of time. It is a measure of a lamp's brightness.
Diese LED-Lampe hat eine Helligkeit von 800 Lumen bei nur 10 Watt Verbrauch.
This LED lamp has a brightness of 800 lumens with a power consumption of only 10 watts.
lumen
In biology and medicine, the inner cavity of tubular organs or structures, such as blood vessels, the intestine, or gland ducts.
Bei einer Arteriosklerose verengt sich das Lumen der Arterien durch Ablagerungen.
In arteriosclerosis, the lumen of the arteries narrows due to deposits.
You can recognize the meaning of 'Lumen' (lumen) from the context. If it is about lamps, light, or brightness, the physical unit is meant. In texts about medicine or biology that mention organs such as arteries or the intestine, the cavity is meant.
Für das Wohnzimmer empfehle ich eine Lampe mit mindestens 1000 Lumen.
For the living room, I recommend a lamp with at least 1000 lumens.
Both meanings of 'Lumen' (lumen) belong to technical language. The physical unit is used in technology and commerce, while the biological meaning is used in medicine and science.
Der Arzt erklärte dem Patienten die Verengung im Lumen der Herzkranzgefäße.
The doctor explained the narrowing in the lumen of the coronary vessels to the patient.
As a unit of brightness, 'Lumen' (lumen) is almost always used together with a number to indicate the exact light output of a source.
Diese Taschenlampe hat eine beeindruckende Leistung von 3000 Lumen.
This flashlight has an impressive output of 3000 lumens.
In a medical context, the lumen is often described with verbs that express a change in the cavity, for example 'sich verengen' (to narrow), 'sich erweitern' (to widen), or 'blockiert sein' (to be blocked).
Durch die Entzündung hat sich das Lumen des Darms stark verengt.
Due to the inflammation, the lumen of the intestine has narrowed significantly.
