DIN 5044

	DIN 5044-1
Area	Road traffic
title	Fixed traffic lighting; Lighting of roads for motor vehicle traffic; General quality characteristics and guide values
Brief description:	Street lighting requirements
Latest edition	1981-09 (withdrawn)
ISO	-

	DIN 5044-2
Area	Road traffic
title	Fixed traffic lighting; Lighting of roads for motor vehicle traffic; Calculation and measurement
Brief description:	Street lighting requirements
Latest edition	1982-08 (withdrawn)
ISO	-

The DIN standard DIN 5044 Fixed traffic lighting; Lighting of roads for motor vehicle traffic; General quality features and guide values was a standard valid in Germany that dealt with the lighting of roads with motor vehicle traffic. In this context, she dealt with stationary lighting systems inside and outside built-up areas and made recommendations on how the streets should be illuminated. In November 2005, DIN 5044 was largely replaced by DIN EN 13201 in Germany : Parts 2 to 4 of these are valid throughout Europe, while the national part 1 defines comprehensive parameters for lighting situations for Germany as DIN 13201-1 ( without EN ). The residual standard DIN 5044-1 was withdrawn in March 2011.

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The first part named the traffic-related criteria for the use of street lighting. In addition, lighting quality features were defined and guidelines were set. The standard also contained instructions for the design of lighting systems.

The second part made specifications for the luminance evaluation of road surfaces and specified calculation methods for lighting systems. Measurement methods for lighting were also described.

Definitions

The safe application of DIN 5044 requires an understanding of various lighting terms, which are briefly explained in the following list:

• The evaluation field is a selected lane section that is used to evaluate the lane luminance of a street area. The field begins 60 meters in front of the observer and ends at a distance of 160 meters. The observer's position is on the center line of the right-hand lane at a height of 1.5 meters above the carriageway. The width of the evaluation field is identical to the width of the lane.
• The lane luminance relates to the evaluation field and is the mean luminance on the lane in this field. The object luminance is the luminance of objects (such as pedestrians, parked vehicles) on the roadway. The brightness contrast is the difference between the object and lane luminance , based on the lane luminance . The positive contrast or negative contrast is the brightness contrast with positive / negative difference between object and roadway luminance.
• The light point describes the calculated starting point of the luminous flux of a luminaire. The distance between two successive light points is called the light point distance . Furthermore, the term light point height is understood to mean the vertical distance between the light point and the road surface. The distance between the perpendicular of the light point and the edge of the road is called the light point overhang .

The following general lighting units are also used in the standard:

Overview of photometric quantities and units

Physical size				SI unit		Remarks
designation	symbol	definition	dimension	Surname	symbol
Luminous flux luminous flux, luminous power	${\displaystyle {\mathit {\Phi _{\mathrm {v} }}}}$	${\textstyle {\mathit {\Phi _{\mathrm {v} }}}=\!\int {\frac {\partial {\mathit {\Phi _{\mathrm {e} }}}(\lambda )}{\partial \lambda }}K(\lambda )\,\mathrm {d} \lambda }$	${\displaystyle {\mathsf {J}}\,}$	Lumens	lm = cd · sr	Radiation power of the light source, weighted with the sensitivity of the human eye
Luminous intensity luminous intensity	${\displaystyle I_{\mathrm {v} }\,}$	${\textstyle I_{\mathrm {v} }={\frac {\partial {\mathit {\Phi _{\mathrm {v} }}}}{\partial {\mathit {\Omega }}}}}$	${\displaystyle {\mathsf {J}}\,}$	Candela	cd = lm / sr	cd is the SI base unit ; obsolete units: Hefner candle (HK), international candle (IK), new candle (NK)
Illuminance illuminance	${\displaystyle E_{\mathrm {v} }\,}$	${\textstyle E_{\mathrm {v} }={\frac {\partial {\mathit {\Phi _{\mathrm {v} }}}}{\partial A}}}$	${\displaystyle {\mathsf {L^{-2}J}}}$	lux	lx = lm / m 2	obsolete units: Nox  (nx), Phot  (ph)
Radiance luminous emittance	${\displaystyle M_{\mathrm {v} }\,}$	${\textstyle M_{\mathrm {v} }={\frac {\partial {\mathit {\Phi _{\mathrm {v} }}}}{\partial A}}}$	${\displaystyle {\mathsf {L^{-2}J}}}$	Lumens per square meter	lm / m 2	The unit lm / m 2 corresponds formally to the lux; however, the lux is only used for the radiation that hits a surface, not for the radiation emanating from it.
Luminance luminance	${\displaystyle L_{\mathrm {v} }\,}$	${\textstyle L_{\mathrm {v} }={\frac {\partial ^{2}{\mathit {\Phi _{\mathrm {v} }}}}{\partial {\mathit {\Omega }}\cdot \partial A\cdot \cos \varepsilon }}}$	${\displaystyle {\mathsf {L^{-2}J}}}$	Candela per square meter	cd / m 2	cd / m 2 is sometimes called nit ; obsolete units: stilb  (sb), apostilb  (asb), lambert  (la)
Amount of light luminous energy	${\displaystyle Q_{\mathrm {v} }\,}$	${\textstyle Q_{\mathrm {v} }=\int \!{\mathit {\Phi _{\mathrm {v} }}}(t)\,\mathrm {d} t}$	${\displaystyle {\mathsf {T\cdot J}}}$	Lumen second	lm · s	lm s is also called Talbot or Lumberg (no standard)
Exposure luminous exposure	${\displaystyle H_{\mathrm {v} }\,}$	${\textstyle H_{\mathrm {v} }=\int \!E_{\mathrm {v} }(t)\,\mathrm {d} t}$	${\displaystyle {\mathsf {L^{-2}T\cdot J}}}$	Lux second	lx s	Amount of light per unit area
photometric radiation equivalent luminous efficacy	${\displaystyle K}$	${\textstyle K(\lambda )={\frac {\mathit {\Phi _{\mathrm {v} }}}{\mathit {\Phi _{\mathrm {e} }}}}}$	${\displaystyle {\mathsf {M^{-1}L^{-2}T{^{3}}J}}}$	Lumens per watt	lm / W	indicates the sensitivity of the human eye at a given wavelength λ
Luminous efficiency luminous efficacy	${\displaystyle \eta }$	${\textstyle \eta ={\frac {\mathit {\Phi _{\mathrm {v} }}}{P}}}$	${\displaystyle {\mathsf {M^{-1}L^{-2}T{^{3}}J}}}$	Lumens per watt	lm / W	contains in addition to K (λ) the efficiency of the light source for generating electromagnetic radiation

For a list of the corresponding radiometric quantities and units, see Radiometry .

Web links

• Information on DIN 5044 and the new DIN EN 13201

References