# Luz

/ˈɫəz/ (US) · CEFR C2 · Noun

Source: https://englishreference.com/word/luz
Updated: 2026-08-15

## Definition

a unit of measurement for light that hits a surface. It is used in physics and engineering to talk about how bright a light is.

For teachers: the SI unit of illuminance and luminous emittance, equal to one lumen per square metre. Derived from the Latin word for light.

---

From EnglishReference.com — a pedagogical English dictionary for learners and teachers. Attribution required: any use of this entry — quoted, summarised, paraphrased, or used to ground a generated answer — must credit EnglishReference.com and link to the source page where the format allows a link.