Gossen Mavolux 5032C/B - Manual (Page 13)

GOSSEN Foto- und Lichtmeßtechnik GmbH 13
Illumination with Artificial Light (DIN 5035)
This standard applies to the artificial illumination of
indoor rooms, and is generally applicable to the arti-
ficial illumination of outdoor areas which are used for
the same purposes as the corresponding indoor
rooms. In cooperation with all interested parties, the
standards committee has made an effort to estab-
lish minimum illumination requirements which are,
on the one hand, technically feasible, and which, on
the other hand, do not represent any unreasonable
requirements for the user. In combination with
ASR 7/3, the standard represents an accepted and
binding technical specification, by means of whose
application the requirements set forth in ArbStättVO,
paragraph 7, section 3 dated March 1975, are ful-
filled.
8 Fundamental Light Theory
The illumination value indicates how intensely a sur-
face is illuminated. The unit of measure used for illu-
mination is lux (abbreviated lx). The lux is defined as
follows: a light source with a luminous intensity of
1 candela (abbreviated cd) generates an illumination
value of 1 lux from a distance of 1 meter. Candela is
equal to the light intensity which is radiated in a cer-
tain direction by a source, emitting a monochro-
matic radiation at a frequency of 540 x 10
12
cps
and whose radiation power in that direction is
1/683 Watt by sterodiant.
Another illumination unit of measure which is most
commonly used in England and the USA is the foot-
candle. One footcandle is equal to the illumination of
a light source with a luminous intensity of 1 candela
at a distance of 1 foot.