ingineria iluminatului - Journal of Lighting Engineering - Prof. Florin ...

C BIANCHI, Andreea BIRO
dim electric lighting based on the
daylight available, in order to
permanently ensure the conditions of
visual comfort, and to balance the
permanent variations of daylight, caused
by the natural variations throughout the
day and by the changing weather
conditions (clear sky, cloudy sky). Direct
access of unprocessed daylight into
modern working spaces is not
acceptable.
It has to be mentioned that, according to
the current European legislation that came
in force since 2009, classical low energy
efficient incandescent lamps are not to be
used in any location.
Today, with the exception of emergency
lighting, it is recommended the use of
halogen lamps (HL). Therefore these lamps
shall replace the classical incandescent
lamps in local decorative lighting systems,
and even in emergency lighting, and they
can be used when from aesthetical reasons,
it is required the possibility to dim the light
from 0-100% in certain areas. It must be
highlighted that halogen lamps can also be
used locally when a perfect colour rendition
is required (they have a 100% colour
rendition).
Another important aspect in obtaining a
comfortable, functional and energy efficient
luminous environment is the modern design
of the integrated lighting systems (daylightelectric
light), based on the European
regulations, such as CIE, and on the
specific conditions of the interior space, as
shown in Figure 4.
Also, the architectural integration of
lighting systems is a vital condition for
obtaining an aesthetic luminous
environment, when the lighting is made
using daylight, electric light as well as the
combination of the two.
These two light sources cannot be
generally used, and their flexibility depends
from case to case, on:
- the aesthetic level;
- the possibilities of change in time;
- the destination of the space.
In some particular cases (when change
of position is required, or change of
destination in time, and so on) it is
recommended the use of flexible lighting
systems that can be changed in time and
space.
3 The structure of lighting systems that
are integrated into modern buildings
In Romania, electric lighting systems
were and still are generally designed as
“static” system, with potential manual
dimming possibilities depending on the
level of daylight. The new attitude
promoted by the Romanian National
Lighting Committee (RNLC), the Lighting
Department of the Technical University of
Civil Engineering Bucharest, dealers and
manufacturers consists in the creation of
permanently dynamic integrated lighting
systems, with the possibility of automatic
dimming of electric light depending on the
level of daylight.
Figure 5 represents the natural and
electric lighting systems in the classical
version and in the permanently dynamic
modern/integrated version, recommended
today, but rarely applied in Romania.
28 Ingineria Iluminatului 2010; 12, 2: 23-31