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Table A.7 — Typical values of the Power Density Indicator D_P in mW-br^nr² for road profile D

Table A.8 — Typical values of the Annual Energy Consumption Indicator De in kWh-m ²
for road profile D

A.3.6 Road and two sidewalks on both sides (road profile E)

Table A.9 — Typical values of the Power Density Indicator D_Pin mW-lx-i-m ²for road profile E

Table A.10 — Typical values of the Annual Energy Consumption Indicator De in kWh-nr²
for road profile E

A.3.7 Road and two sidewalks on both sides separated from carriageway by grass strips (road profile F)

Table A.ll — Typical values of the Power Density Indicator Dp in mW-lx^-m ² for road profile F

Table A.12 — Typical values of the Annual Energy Consumption Indicator D_Ein kWh-nr²
for road profile F

A.3.8 Typical values of AECI for different operational profiles

Typical values of AECI presented in A.3.2 to A.3.7 apply to full power operational profile (see A.1.2) with annual operation time 4 000 h. To consider different operational profiles it is usually sufficient to combine the annual operation times of individual lighting levels with the associated system power and the detection probability (in systems with detectors) into a single lighting operation coefficient c_op. This coefficient can be used to multiply the AECI for full power operation to obtain the value of AECI for actual operational profile.

Table A.13 shows typical values of the lighting operation coefficient c_op for different operational profiles under these assumptions:

— Full power: 4 000 h operation at full power P;

— Bi-power: 2 175 h at full power P and 1 825 h at reduced power 0,7 P with lighting level reduced to 50 %;

— Tri-power: 2 175 h of bi-level lighting control between 100 % and 60 % of the system power with detection probability of 80 % and 1 825 h of reduced bi-level lighting control between 20 % and 60 % of system power with detection probability of 20 %.

Table A.13 — Typical values of the lighting operation coefficient c_opin % for different
operational profiles

Annex В

(informative)

Installation luminous efficacy

B.l General

Installation luminous efficacy is calculated with the following formula:

⁷7inst^=CL/M^y'^/?LO'⁷7ls’⁷7p (^B1)

where

Ф^пя is the installation luminous efficacy in Im-W¹;

Cl is the correction factor for luminance or hemispherical illuminance based lighting designs;

/м is the overall maintenance factor (MF) of the lighting installation;

U is the utilance of the lighting installation;

7?lo is the optical efficiency of luminaires used in the lighting installation;

is the luminous efficacy of the light sources used in the installation in Im W¹;

r/p is the power efficiency of luminaires used in the lighting installation.

The installation luminous efficacy r/inst should be evaluated considering the real operating conditions of the lighting installation.

Maintenance factor should be the same as used for the calculation of photometric parameters according to EN 13201-3.

In case the minimum requirement for one or more areas is expressed in road surface luminance, the ability of the lighting installation to produce luminance may be relatively high or low either because of a value of the average luminance coefficient of the road surface Qo deviating from the normally assumed value of 0,07 cd-m ²-lx¹ or because of a particular directionality of the illumination. Correction factor accounting for these two aspects is calculated with the following formula:

C_L ^(Ёідпіп /М/Фд (B.2)

>=i

where

£j _mjn is the minimum required average illuminance;

A, is the sub-area to which the minimum required average illuminance applies;

Фа is the luminous flux reaching the area to be illuminated.

n is the number of sub-areas to be lit.

For an area A, where the lighting design criterion is the minimum road surface luminance Ц,_тп, the value of the minimum required average illuminance is set to:

E

(B.3)

i,min = Lj,min /0,07

For an area Лі where the lighting design criterion is the hemispherical illuminance Ehs, the value of the minimum required average illuminance is set to:

E

(B.4)

i,min = E_hs/ 0,65

NOTE The value 0,65 is empirical and represents an average value for variety of lighting installations.

Utilance (If) is defined as the ratio of the luminous flux received by the reference surface to the sum of the individual total fluxes of the luminaires of the installation:

Ф л

U = £ (B.5)

ⁿlu '^фІзАо

where

Фа is the luminous flux reaching the area to be illuminated, in Im;

Фі₅ is the luminous flux emitted from the light source(s) in a luminaire, in Im;

/?lo is the optical efficiency of luminaires used in the lighting installation;

niu is the number of luminaires of the installation.

Luminous efficacy of a luminaire is lower than luminous efficacy of the lamp(s) inside due to optical losses and consumption of the control gear. Optical efficiency 7?lo, sometimes abbreviated as LOR (Light Output Ratio) is the ratio of luminous flux going out from a luminaire and the luminous flux of the lamp(s) inside this luminaire. It can be calculated from photometric data of luminaires and it is usually provided by luminaire manufacturers.

Power efficiency of a luminaire is the ratio between power of lamp(s) and the system power of the luminaire:

n_P=PJP (B.6)

where

Pis is the power of lamp(s) inside the luminaire, in W;

P is the system power of the luminaire, in W.

NOTE 1 For some LED based luminaires values for P|_S, z/i_s and P_Lo are not available and need to be replaced by the overall luminaire’s luminous efficacy.

NOTE 2 In general, the system power P can include also other devices which are outside luminaires but directly associated with the area to be illuminated.

Annex C

(informative)

Lighting factor of an installation

C.l Installation lighting factor Qinst

EN 13201-2 prescribes that the lighting installations for the motorized roads be designed and realized according to the average road luminance levels (M lighting classes). However, the power density indicator (Dp), the system power (P) and the annual energy consumption indicator (De) depend on the average horizontal illuminance (E).

Where M lighting classes are used the lighting designer should select the luminaires that realizing the road luminance L as defined in EN 13201-2 with the lowest road illuminanceE. With this aim, it is essential to use a simple parameter for an easy and quick comparison of the energy performance obtained with different luminaires and/or in different installations. This can be done through the installation luminance factor q_inst, defined as:

(C.l) 4) ■

where

£ is the calculated average maintained road luminance in accordance with EN 13201-3:2015, 7.1 and 8.2, in cdnr²;

E is the calculated average maintained horizontal illuminance of the road surface when the road surface luminance is L, in lx;

Qo is the average luminance coefficient of the r-table adopted in luminance calculation, in sr¹.

NOTE It is a normalizing parameter, which gives q_inst a dimensionless character through reference to a standardized photometric property of the road surface.

C.2 Role of qmst in road lighting design aimed at energy saving

The factor <?inst proposed here follows the suggestions of the CIE 144 for a careful consideration of the quotient luminance/illuminance in road lighting. The factor q_inst, whose typical range is between 0,8 and 1,3, is in close correlation with energy consumptions and environmental compatibility: for example, increasing values of </_inst within the said range correspond to a 40 % decrease of the power density indicator Dp, a result which cannot be neglected.

The factor qinst, characterizes the energy performances of road lighting installations independently of the lighting components used for its actual realization: road luminance and illuminance can be either taken from the lighting design or measured on the road. Thus, the energy performances can be assessed in any case, even if nothing is known about its light source, luminaires, etc. Moreover, at the design stage the performances about energy consumptions can be evaluated immediately, without any further calculations. In all cases, q_inst permits an easy comparison of the efficiency of different types of installations, particularly between old and state-of-the-art ones.