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Lux in Irish (Lucsa): Meaning, Pronunciation, Usage

The Irish for lux is lucsa, a masculine noun (plural lucsaí).
Updated October 2026Report a mistake

How to say “lux” in Irish

Irish:
lucsa
English:
lux
Word type:
noun
Gender:
masculine, fourth declension
Pronunciation:
“LUK-suh”  /ˈl̪ˠʊksə/
Various forms
Plural:
lucsaí (luxes)
Genitive singular:
lucsa, an lucsa (e.g. luach lucsa amháin, the value of one lux)
Genitive plural:
lucsaí, na lucsaí (e.g. luach na lucsaí, the value of the lux readings)

What does “lucsa” mean?

lux
The lux is the unit of illuminance, measuring how much light falls on a surface.Also: unit of illuminance, light measurement.

“Lucsa” with the article

The plural of lux in Irish is lucsaí. Here is lucsa after the article (an t-alt), in the singular and the plural.

an lucsa
the lux
No change after an
na lucsaí
the luxes
Plural: no change after na

“Lucsa” in a sentence: Irish examples

Common Irish sentences using lucsa, the Irish word for lux.

Is aonad soilseachta é an lucsa.
The lux is a unit of illuminance.
Tá cúig chéad lucsa sa seomra ranga seo.
There are five hundred lux in this classroom.
Tomhaiseann an méadar seo an solas i lucsaí.
This meter measures the light in lux.
Cé mhéad lucsa atá ag teastáil san oifig?
How many lux are needed in the office?
Thug an múinteoir sainmhíniú an lucsa dúinn.
The teacher gave us the definition of the lux.
Is ionann lucsa agus lúman sa mhéadar cearnach.
A lux equals one lumen per square metre.
Tá níos mó lucsaí ag teastáil chun léamh.
More lux are needed for reading.

Other nouns in Irish

More everyday Irish nouns to learn next.

Lux in Irish: frequently asked questions

What is the Irish for lux?

The Irish for lux is lucsa (pronounced “LUK-suh”). It’s a masculine noun and the plural is lucsaí.

How do you pronounce lucsa in Irish?

Lucsa is said like “LUK-suh” (IPA /ˈl̪ˠʊksə/).

What is the plural of lux in Irish?

The plural of lucsa is lucsaí; with the article, na lucsaí means “the luxes”. The genitive plural is lucsaí, as in luach na lucsaí (the value of the lux readings).

What is the difference between lucsa and lúman?

A lúman measures the total light given out by a source, while a lucsa measures how much light lands on each square metre of a surface.

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