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Words related to luminous

lu·mi·nous
L l

  • candle

    A candle is a stick of hard wax with a piece of string called a wick through the middle. You light the wick in order to give a steady flame that provides light.

  • candela

    the basic SI unit of luminous intensity; the luminous intensity in a given direction of a source that emits monochromatic radiation of frequency 540 × 1012 hertz and that has a radiant intensity in that direction of (1⁄683) watt per steradian

  • luminosity

    luminance (def 2).

  • luminous efficiency

    the perceived brightness of light as a ratio of the total luminous flux to total radiant flux of the source; a measure of brightness obtained by dividing the source's luminous flux by the consumption of its energy.

  • phosphorescence

    the property of being luminous at temperatures below incandescence, as from slow oxidation in the case of phosphorus or after exposure to light or other radiation.

  • apparent candlepower

    a measure of the luminous intensity of an extended source of light in terms of the candlepower of a point source of light that has an equivalent luminous intensity when placed at the same distance as the extended source.
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