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Optical Utilization Factor for Architectural Lighting. L&E 27 (6) 2019

Light & Engineering 27 (6)

Volume 27
Date of publication 12/20/2019
Pages 49-57

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Optical Utilization Factor for Architectural Lighting. L&E 27 (6) 2019
Articles authors:
Cătălin Daniel Gălăţanu, Muhammad Ashraf, Dorin Dumitru Lucache, Dorin Beu, Călin Ciugudeanu

Cătălin Daniel Gălăţanu, Professor, Department of Building Services, Faculty of Civil Engineering, Technical University Gh. Asachi from Iasi, Bd. Mangeron 67, Iasi 700050, Romania (e-mail: catalin.galatanu@tuiasi.ro)

Muhammad Ashraf, Assoc. Professor, Department of Electrical Engineering, Faculty of Engineering, Capital University of Science and Technology CUST, Kahota Road, Islamabad, Pakistan, E mail: ashraf@cust. edu.pk

Dorin Dumitru Lucache, Professor, Department of Electrical Engineering, Faculty of Electrical Engineering, Energetics and Applied Informatics, Technical University Gh. Asachi from Iasi, Bd. Mangeron 21-23, Ia?i. 700050, Romania, E-mail: dorin.lucache@tuiasi.ro Dorin Beu, Assoc. Professor, Department of Electrical Engineering, Faculty of Building Services, Technical University Cluj Napoca, B-dul 21 Decembrie 1989, nr. 128- 130, Cluj Napoca 400604, Romania E-mail: dorin.beu@ rogbc.org

Dorin Beu, Assoc. Professor, Department of Electrical Engineering, Faculty of Building Services, Technical University Cluj Napoca, B-dul 21 Decembrie 1989, nr. 128–130, Cluj Napoca 400604, Romania E-mail: dorin.beu@rogbc.org

Călin Ciugudeanu, Lecturer, Department of Electrical Engineering, Faculty of Building Services, Technical University Cluj Napoca, B-dul 21 Decembrie 1989, nr. 128- 130, Cluj Napoca 400604, Romania E-mail: calin. ciugudeanu@rpe.ro

Abstract:
Optical utilization factor (OUF) is applied to architectural lighting, searching to obtain low light pollution. It is demonstrated that OUF could not be used for the assessment of light pollution, because the inter-reflections could not be neglected. DIALUX simulations and MATLAB original functions are used. Onsite measurements for illuminance and luminance are performed. It is demonstrated that OUF could be greater than one for the facade. For the small scale inter-reflections, a luminance gain is demonstrated. Due to this, the floodlighting could be reduced. The understanding about the light pollution assessment is changed, which is a major achievement. It means that a greater OUF don’t represent a lower light pollution, and also a facade could be more “visible” on lower level of floodlighting.
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