The original proposal has been
derived from the Lombardy
law
LR 17/2000 (see cielobuio.org/arc-lrl17a.php
for more info); this
in turn is based on the experience with the older laws of another
Italian regions (and consequently on the extensive Italian practice in
preventing the light pollution). Compared to the Lombardy law,
the
second version of the draft of the statutory order
omitted or made less
strict many measures, also the diction is made simpler.
A simple definition of ``one lighting point'' has been introduced, as a
sphere with a radius of 2 m around the light source.
In September 2002 the proposal has been supplemented by explicit
upper limits for the amount of light, as they are contained in the
laws of Italian regions Lazio and Marche (and in the
deliberation of the Council of Lombardy). The present base
information source is the
brochure on the application of the Lombardy law 17/00.
Limits valid also for billboards with internal lighting are added
moreover.
All the new installations of illuminating systems in the
outdoor air, as well as the adaptations of the existing systems, have
to satisfy the rules for the prevention of light pollution according
to this paragraph. This applies as well to changes, which are in the
phase of planning or contract. Those, which are in the phase of
execution already, have to satisfy the requirements of this paragraph
before the end of the year 2003.
Only those illumination systems which conform to the following rules,
are considered as producing no light pollution and minimising also another
pollution of the air:
-
they are composed of luminaires which
do not shine into the upper half-space1
-
they use the best available technology,2
-
they are realized in such a way that
the luminance of the illuminated surfaces does not exceed the value demanded
by the safety standards, if they exist,3
or the value 1 cd/m2, in the absence of safety standards,
-
and they are equipped by the devices capable of reducing the amount of
emitted light by at least thirty per cent compared to the full output,
after 12 p.m. Such reduction of the amount of light is applied
when the conditions of the use of the illuminated surface are such, that
the safety is not endangered.
Requirements of the Article 2 need not be
adhered to for light sources (bulbs) with a luminous flux not exceeding
1500 lumen, if they are at most three in one lighting point4
or if their cumulative luminous flux into the upper half-space
is below 2250 lm for one lighting point,
and for such temporarily5
used sources, which are not in use after 10 p.m. in the season of
the daylight saving time validity and after 8 p.m. outside the season of
the daylight saving time validity.
Illumination of any information boards6
has to be realized just by sending light downwards or by light sources placed
inside the board.
The maximum allowed luminous intensity is 100 cd for boards with
an area of 1 m2 and lower, the maximum allowed luminance is
1 cd/m2 for board with an area of 1000 m2
and larger. For
boards with an area
S between one and one thousand square metres,
their mean luminance
L
has not to be over:
L = 100 cd/m2 .
(S/1m2)-2/3
- i.e., their luminous intensity I over:7
I = L/S = 100 cd . (S/1m2)1/3
Companies which produce, import or supply outdoor fixtures
have to include (among the technical characteristics of the
offered luminaires)
a statement on their conformance with this Order by writing on the product:
``optics producing no light pollution, according to the laws of the
Czech Republic``
and (in the package with the fixture) a text explaining the correct use
of the fixture.
It is explicitly forbidden to use, for merely promotion purposes,
any upward aimed, movable or fixed, bundles of rays of any type.
For the illumination of edifices or monuments,
systems shining downwards
have to be preferred. Only when it is not technically possible, in
case of objects of particular and proven architectonic
and historic
value, another type of lighting can be used.
In such a case, the
margin of the beam has to remain at least one metre below the upper
end of the
surface to be illuminated and within the perimeter of that building
or monument.
The illuminating system has to be equipped with a suitable device to
limit the dispersion of light outside the surface to be illuminated
and it has to be switched off or dimmed at least by one half not
later then at 1 a.m. during the validity of the daylight saving time
or 0 a.m. outside the validity of the daylight saving time.
The maximum allowed mean luminance of the lit surface is 1 cd/m2.
Considering that the time span for lowering the light pollution
by a mere reconstruction of the lighting systems acc. to § 1 is given
by the lifetime of such systems amounting to decades, there are
declared, in the emergency cases, areas with terms for improving
the current state (further just protected areas).
Protected areas are declared in particular around
astronomical observatories.
Protected areas declared by the effective date of this Order are given
in the Appendix.
It is upon the subject, for whose interest the protected area has been
declared by the Government,
to announce this fact to the
concerned municipalities and operators of light sources.
Protected area can be declared on their territory by the
the municipal authorities, within their delegated competences.
All luminaires which do not satisfy the rules
of the § 1 have to be replaced or adapted in such a way, that
they satisfy the rules of the § 1, within four years from the
declaration of the protected area.
An exception is granted to existing luminaires, whose replacement is not
planned within four years, and whose adaptation in such a way, that they
would not emit light into the upper half-space, is not well achievable.
Instead of their replacement by fully shielded luminaires they can be
equipped by suitable shields directing their luminous flux toward the earth
and limiting their specific luminous intensity into the upper half-space
up to at most 15 cd per thousand lumen.
Another solution can be negotiated between the municipality and the
subject, for whose interest the protected area has been
declared.
All kinds of the information boards, which have no specific and
indispensable nighttime purpose, have to be non-illuminated
after 11 p.m. in the season of
the daylight saving time validity and after 10 p.m. outside the season of
the daylight saving time validity.
Persons, including the municipalities which have not complied
with the criteria demanded by this Order in the protected areas, are
suspended of the benefit of a special electricity tariff for
public lighting, until they bring their lighting systems in
accord with this Order. The resolution about that is issued by the
regional authority, within its delegated competences, after a
preceding inspection based on the announcement of the subject, for
whose interest the protected area has been declared. The regional
authority submits the information on such a resolution to the
competent supplier of electricity with the demand to make a new
agreement on the supply with the concerned person.
Subjects, where the protected area is declared with a radius
of 10 km around them:
-
Observatory of the Astronomical Institute of the Academy of
Sciences of Czech Republic, Ondrejov
-
Observatory of the Obs. and Planetarium in Ceské
Budejovice, Klet
Subjects, where the protected area is declared with a radius
of 1 km around them:
-
Observatories of the N. Copernicus Obs. and Planetarium in Brno
and the Astronomical Institute of the Masaryk University, Brno
-
Štefánik Observatory, Prague
-
Observatory, Úpice
-
Observatory, Valašské Mezirící
-
Johann Palisa Observatory and Planetarium, Ostrava
-
Observatory and Planetarium, Hradec Králové
-
Observatory, Vsetín
-
Observatory, Rokycany
-
Observatory, Vlašim
The above listed protected areas will serve as model ones for
the implementation of this Order. Their enlargement
and a series of new ones, esp. around another observatories
accessible to public, should be declared later.
Jan Hollan,
Hvězdárna a planetárium M. Koperníka v Brně
Sept 30, 2002 (translated into English Oct 1, 2002)
Footnotes
- ... half-space1
- As a upper
half-space, usually the directions over the horizontal plane going
through the luminaire are considered. In case of a sloped terrain,
it can be understood as the directions over the plane parallel with
the terrain or over a plane with a slope lying between these two extrema.
As a luminaire which do not shine into such directions, even each such
can be considered, whose specific luminous intensity in these directions,
after being rounded to a whole number, is just 0 cd per thousand lumen
of the luminous flux emitted by the light source (bulb) inside the luminaire.
Such a luminaire is called ``fully shielded''.
- ... technology,2
- as defined in the § 2 Art. 1 of the Act
- ... exist,3
- as such standards, prEN 132 01-1 to -3 (or
CSN 36 0400, 0410 and 0411 in the meantime) can be considered;
for the systems whose luminous flux cannot be regulated continuously it is
allowed that the condition of not exceeding the luminances demanded by such standards
is satisfied only at the end of their planned life
- ... point4
- for the purpose of this Order, by lighting point the area with a radius
of two metres around the light source is meant
- ... temporarily5
- maximum three months
- ... boards6
- any surface serving for advertisement is considered to be an information board
- ... over:7
- the rounded upper limits are therefore
S/m2
|
L/(cd/m2)
|
I/cd
|
3 |
48 |
145 |
10 |
21 |
215 |
30 |
10 |
310 |
100 |
4 |
460 |
300 |
2 |
660 |