Optical Utilization Factor for Architectural Lighting

Author:

Galatanu Catalin Daniel1,Ashraf Muhammad2,Lucache Dorin Dumitru1,Beu Dorin3,Ciugudeanu Calin3

Affiliation:

1. Technical University Gh. Asachi from Iasi

2. Capital University of Science and Technology CUST

3. Technical University Cluj Napoca

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.

Publisher

Redakcia Zhurnala Svetotekhnika LLC

Subject

General Medicine

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