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    Lumen

    /ˈluː.mən/

    Meaning & Definition

    noun
    A unit of luminous flux in the International System of Units (SI), equal to the amount of light emitted per second in a unit solid angle by a uniform source of light of one candela.
    The new LED bulb emits 800 lumens, making it suitable for brightening the entire room.
    The inside space of a tubular structure, such as a blood vessel or a perforated organ.
    The lumen of the artery was narrowed due to the buildup of plaque.
    A measure of the amount of light that is perceived by the human eye.
    The experiment measured the lumens produced by various light sources.

    Etymology

    From Latin lumen, meaning 'light' or 'glow.'

    Common Phrases and Expressions

    lumen per watt
    A measure of the efficiency of a light source.
    in the lumen
    Referring to being well-lit or illuminated.

    Related Words

    luminous
    Emitting or reflecting light; glowing.
    luminance
    The intensity of light emitted from a surface per unit area.

    Slang Meanings

    A casual term for a bright light source.
    That new LED bulb is a total lumen bomb!
    Used informally to refer to something that is extremely bright or eye-catching.
    That car's headlights are lumen city; they light up the whole road!