Luminous intensity expressed in candelas

Related Terms

ILLUMINANCE

The luminous flux per unit of area. The derived unit of illuminance in the International System of Units is the LUX.

LINEAR LIGHT

A luminous signal having perceptible length, as contrasted with a POINT LIGHT, which does not have perceptible length.

AERONAUTICAL LIGHT

A luminous or lighted aid to navigation intended primarily for air navigation. Often shortened to AERO LIGHT.

LUMEN

The derived unit of luminous flux in the International System of Units; it is the luminous flux emitted within unit solid angle (1 steradian) by a point source having a uniform luminous intensity of 1 candela.

LUMINOUS RANGE DIAGRAM

A diagram used to convert the nominal range of a light to its luminous range under existing conditions.

ALTERNATING

Referring to periodic changes in color of a lighted aid to navigation. Alternating fixed and flashing light. A fixed light varied at regular intervals by a single flash of greater luminous intensity, with color variations in either the fixed light or flash, or both.

ALTERNATING FIXED AND GROUP FLASHING LIGHT

A fixed light varied at regular intervals by a group of two or more flashes of greater luminous intensity, with color variations in either the fixed light or flashes or both.

LUMINOUS FLUX

The quantity characteristic of radiant flux which expresses its capacity to produce a luminous sensation, evaluated according to the values of spectral luminous efficiency. Unless otherwise indi- cated, the luminous flux relates to photopic vision, and is connected with the radiant flux in accordance with the formula adopted in 1948 by the International Commission on Illumination. The derived unit of luminous flux in the International System of Units is the LUMEN.

AURORA

A luminous phenomenon due to electrical discharges in the atmosphere, probably confined to the thin air high above the surface of the earth It is most commonly seen in high latitudes where it is most frequent during periods of greatest sunspot activity. If it occurs in the Northern Hemisphere, it is called aurora borealis or northern lights; and if in the Southern, aurora Australis.

LUMINANCE

In a given direction, at a point on the surface of a source or receptor, or at a point on the path of a beam, the quotient of the luminous flux leaving, arriving at, or passing through an element of surface at this point and propagated in directions defined by an elementary cone containing the given directions, by the product of the solid angle of the cone and the area of the orthogonal projection of the element of surface on a plane perpendicular to the given direction. The derived unit of luminance in the International System of Units is the CANDELA PER SQUARE METER.

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