Luminous Intensity

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2-1-035

Luminous Intensity (of a source, in a given direction)

The quotient of the luminous flux (dF) leaving the source, propagated in an element of solid angle containing the given direction, by the element of solid angle (dO).

Ch2 Fig1.jpg


Symbol: I

Unit: candela(cd)

Reference: C.I.E. (modified)


Note 1: If within a cone of finite solid angle O the luminous flux may be considered uniformly distributed, then the luminous intensity is given by

(Equation)

where F is the total luminous flux emitted within the solid angle.


Note 2: The term Candlepower designates a luminous intensity expressed in candelas.




Please note that this is the term as it stands in the original IALA Dictionary edition (1970-1989)

charge current

Intensity

candela

Contrast

Celsius (previously Centigrade)

Capacitance

Illuminance

Energy

nertia of the water plane

axis of the centre of water plane

force

Farad

Fahrenheit

International Association of Marine Aids to Navigation and Lighthouse Authorities - AISM