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Objective measurements of light trespass and surfaces Marc Gillet Prof. Rombouts (Univ. Brussels) with collabor. Univ. Berlin (prof. Kaase)

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Main Conclusions 1. Precise Algorithm and measurement system to calculate upward flux 2. Reduction of SKY GLOW is FIRST A QUESTION OF PERFORMANCE i.e REDUCE the installed lumen package for the same “lighting levels”

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Main Conclusions (II) Therefore : interest for dimming ---> interest for dimming to reach “J.N” flux interest for an “in situ” roadpavement measurement system ---> interest for an “in situ” roadpavement measurement system (to minimize installed flux)

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Summary 1. Introduction 2. Algorithm 3. Measurements 4. Calculations

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1. Introduction Many authors work with reflection Assumptions for ” ” Wide variation = 0.07 = 0.10 = 0.18

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2. Algorithm (I) = r / i L p = q ( , ). E p r = ( , nature of road).E.dS = ( i.dS).E i

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Algorithm (II) / case of a road ROAD Surround

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3. Measurements (I) X P 750 P´’ Baffle Detector Sample

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Measurements (II)

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Measurements (III)

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Measurements (IV)

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Measurements (V) Highly VARIABLE Increases with Lower for Asphalt than Concrete Flatter in the case of Concrete

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4. Conditions of Calculations Road Width = 7m Overhang = -1m Single sided arrangement H=10m Spacing optimized to obtain ->L=0.75cd/m² ->U0 >40% ->Ul > 60% ->TI < 15%

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4. Conditions of Calculations (II) Dimming to obtain the “J.N” various Light Distributions Optimization on Asphalt Porous Asphalt Concrete Calculation of t = d + r

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4. Calculations(IV) TOTAL UPWARD FLUX (Asphalt) INSTALLED LAMP KLM/KM

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4. Calculations (V) TOTAL UPWARD FLUX (Asphalt)

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4. Calculations (VI) REPARTITION OF FLUXES

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4. Calculations (VII) ave = reflect. /(E.S) with reflect from calculation tool and E from “lighting design soft.”

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4. Calculations (VIII) Ref. and C.g = 7.4% = 50° Flat glass = 7.2% = 46°

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4. Calculations (IX) TOTAL UPWARD FLUX (Porous Asphalt)

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4. Calculations (X) TOTAL UPWARD FLUX (Concrete)

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6. Near Future Refine analysis for surroundings CELMA guidance notes soon

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