Lm (Noun)
Meaning
A unit of luminous flux equal to the amount of light given out through a solid angle of 1 steradian by a point source of 1 candela intensity radiating uniformly in all directions.
Classification
Nouns denoting quantities and units of measure.
Examples
- The lumen is the SI unit of luminous flux, a measure of the total amount of visible light emitted by a source per unit time.
- A typical household light bulb emits around 800 lumens of light, while a more energy-efficient LED bulb may emit around 1000 lumens.
- The lumen is often used to measure the brightness of light sources, such as lamps and light fixtures, in order to determine their effectiveness.
- The term "lumen" is often confused with "lux", which is a measure of the amount of light that falls on a surface, rather than the amount of light emitted by a source.
- In lighting design, the lumen is used to calculate the total amount of light required to illuminate a space, taking into account factors such as room size and desired brightness.