luminous emittance: meaning, definition, pronunciation and examples
Very LowTechnical/Scientific
Quick answer
What does “luminous emittance” mean?
The luminous flux emitted per unit area of a light source.
Audio
Pronunciation
Definition
Meaning and Definition
The luminous flux emitted per unit area of a light source.
A quantitative measure in photometry describing the density of visible light emission from a surface, used to characterize the brightness of light sources like screens or panels.
Dialectal Variation
British vs American Usage
Differences
No significant lexical differences; the term is identical and standardized in both scientific communities.
Connotations
Purely technical, with no cultural connotations.
Frequency
Extremely rare outside specific technical fields (e.g., lighting design, display technology, optical engineering).
Grammar
How to Use “luminous emittance” in a Sentence
The [noun phrase] has a luminous emittance of [value].Luminous emittance is a key parameter for [light source].Vocabulary
Collocations
Examples
Examples of “luminous emittance” in a Sentence
adjective
British English
- The luminous emittance value was critical.
American English
- The luminous emittance measurement is standard.
Usage
Meaning in Context
Business
Rare, only in technical product specifications for lighting or display manufacturers.
Academic
Used in physics, engineering, and photometry research papers and textbooks.
Everyday
Virtually never used.
Technical
Core term in photometry, lighting engineering, and display technology.
Vocabulary
Synonyms of “luminous emittance”
Neutral
Weak
Vocabulary
Antonyms of “luminous emittance”
Watch out
Common Mistakes When Using “luminous emittance”
- Confusing it with 'luminance' (which includes light reflected from a surface).
- Using 'luminosity' or 'brightness' as imprecise synonyms.
- Misspelling as 'luminous emitence'.
FAQ
Frequently Asked Questions
No, 'brightness' is a subjective perception, while luminous emittance is an objective, quantifiable physical quantity.
The SI unit is lux (lumens per square metre, lm/m²). The imperial unit is the foot-candle (lumens per square foot).
Luminous emittance refers to light emitted from a source. Luminance refers to light coming from a surface, which can be due to emission, reflection, or transmission.
It is used by lighting engineers, display technologists, optical physicists, and anyone working in the science of photometry.
The luminous flux emitted per unit area of a light source.
Luminous emittance is usually technical/scientific in register.
Luminous emittance: in British English it is pronounced /ˌluː.mɪ.nəs ɪˈmɪt.əns/, and in American English it is pronounced /ˌluː.mə.nəs ɪˈmɪt.əns/. Tap the audio buttons above to hear it.
Learning
Memory Aids
Mnemonic
Think of a luminous (glowing) surface that EMITS light; its 'luminous emittance' is how much light it EMITS per square metre.
Conceptual Metaphor
N/A (Highly technical term).
Practice
Quiz
Luminous emittance is a measure of what?