Centre for Sensors, Instruments and Systems Development

Universitat Politècnica de Catalunya

Shaping light to your needs

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Energy-efficient illumination systems
Mobile photometric device for street illumination
Luminous flux map including directional information, acquired with the integrated sensore developed in the POLUX project
Directional luminous flux sensor


Photometric mobile device for street lighting monitoring

Principal investigator

Josep Arasa Martí [+info]


Street lighting installations typically provide illumination in excess, usually 20%. This is because the installation is designed so that at the end of his life still provides the specified amount of light avoiding component renewal. This conception of a strret lighting installation leads to wasted energy and money: for medium municipality (200,000 h), about 400,000 € / year.

This excess consumption is the basis on which work ESCOs (Energy Service Companies), with the installation of the photometric audit being a basic tool for the implementation of energy service, beyond the verification of compliance with existing regulations .

The aim of POLUX is to develop a mobile device capable of measuring photometric lighting of a whole scene, providing information on quantity and quality of light, as well as the regulatory compliance of lighting and light pollution.

The scientific and technical challenge of a mobile photometric device for street lighting lies on the measurement of luminous flux per unit area of ​​the facility and its directionality, from a mobile device referenced to the facility being assessed.

There are differences and equivalences between the photometer and the proposed measuring instrument. Light meters are devices for measuring the total luminous flux per unit area (lux) on the surface on which you place the meter but do not measure their directionality. Unlike these tools, the device designed in the framework of the POLUX project, both simultaneously evaluates the luminous flux and its directionality , obtaining a precise photometry of the areas studied.

The availability of these data to assess the regulatory compliance of lighting and light pollution in force in a facility, its commissioning and maintenance operations, identifying potential regulatory failure or malfunction of a luminaire and how it affects the whole installation.

The project has a single clear objective: the development of a mobile photometric device capable of performing a photometric audit  of a street lighting installation.

The POLUX project raised the following technical objectives:

• Measurement Technology: Development of a single directional photometric sensor capable of operating on the street

• Development of a measuring integarted sensor consisting of a single set of sensors covering the whole scene

• Installation of the integarted sensor along with a data communication system in a vehicle

• Data communication: Collection of measurement data and transmission to the management unit

• Management and visualization of data processing information provided by the integarted sensor, to visualize and analyze the results


AIDO (Instituto Tecnológico de Óptica, Color e Imagen) [+info]

FIBERCOM S.L. [+info]




File download

POLUX Overview.pdf [PDF - 2.49 MB]

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