lm

Thân thiện

Definition

1. Noun:
   • A unit of luminous flux: "lm" is a unit of measurement for luminous flux, which is the total quantity of visible light emitted by a source per unit of time. It is 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.

Usage Examples

• Noun:
  • This LED bulb has an output of 800 lm.
  • Luminous efficacy is often measured in lumens per watt (lm/W).
  • The specification lists the luminous flux as 1500 lm.

Advanced Usage

• "lm" as an abbreviation: The term "lm" is almost exclusively used as the standard abbreviation for the unit "lumen." It is typically used in technical specifications, packaging, and scientific contexts.
  • Compare the lm rating when choosing energy-efficient lighting.

Variants and Related Words

• Lumen (full word): The full term for which "lm" is the abbreviation.
  • One lumen (lm) is a relatively small unit of light.

Synonyms

• Luminous flux unit: A general term for units measuring luminous flux, with "lm" (lumen) being the SI unit.

Notes on Meaning

• Scientific/Technical Term: "lm" is a specialized term from photometry (the science of light measurement). It does not have everyday conversational meanings or idiomatic uses. Its meaning is fixed and technical.
• Not a Common Word: It is an abbreviation and unit symbol, not a standard English word with multiple definitions or parts of speech. It is always used as a noun in the context of measurement.

Học thuật

Noun

1. 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

Từ đồng nghĩa

• lumen