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.
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.
canal / channel
'der Kanal' and 'das Lumen' can both have to do with tube-shaped structures in the body in medicine and biology. 'Kanal' refers more to the whole tube-like structure or passage. 'Lumen' refers more precisely to the inner cavity in such a structure, that is, the space through which blood or fluid flows, for example. The words can be confused because both occur with tubes in the body. In practical terms: the 'Kanal' is the structure; the 'Lumen' is the inner space inside it.
Bei der Untersuchung war das Lumen des Blutgefäßes deutlich verengt.
During the examination, the lumen of the blood vessel was clearly narrowed.
Die Ärztin sieht auf dem Bild einen engen Kanal im Gewebe.
The doctor sees a narrow canal in the tissue on the image.