Luminous intensity
The luminous intensity describes the quantity light that
is radiated parti
cular direction.g.
Illuminance: E(lx) =
luminous flux (lm)
area (m2)
Luminance
Luminance the only basic lighting para
meter that is
perceived the eye. Relevant standards specify the required illuminance
(e. This useful measure-
ment for directive lighting elements such reflectors.11
The Lighting Handbook
Luminous flux
The luminous flux describes the quantity light emitted
by light source.
Abbreviation: Phi Unit: Lumen
Abbreviation: Unit: Candela
Abbreviation: Unit: Lux
Abbreviation: Unit: cd/m2
Illuminance
Illuminance describes the quantity luminous flux falling on
a surface.
. 12464 “Lighting indoor workplaces”). is
represented the luminous inten
sity distribu
tion curve
(LDC).
The luminous efficiency the ratio the luminous flux
to the electrical power consumed (lm/W).
It describes the one hand light source’s impression of
brightness, and the other, surface and therefore depends to
a large extent the degree reflection (colour and surface). measure
of light source’s economic efficiency
