Application specific quality metrics for SSL

This activity aims to harvest from the metrological and research work carried out in the earlier activity of the project and translate this into the language of manufacturers and users, producing understandable metrics. In the process of realising traceable ‘quality-metrics’ for the specification of SSL in specific applications, input from interested parties in the user and manufacturer community, normalisation bodies (CEN), scientific commissions (CIE), the stakeholder committee and JRP-Partners are vital. The criteria are also validated along field measurements and in laboratory assessment of available SSL products. An open interaction with interested parties is realised through the website realised in WP 5. The traceable quality-metrics for the specification of SSL on the website will be updated periodically as new information becomes available with feedback from other WPs. Case studies are used to illustrate the quality metric use in design, maintenance and management of SSL applications.

The five tasks in this work package are:

Setup of a framework for quality metrics concept diffusion

The aim of this task is to develop and implement a methodology for realisation of accepted quality metrics for unambiguous characterisation of SSL products. In the process of realising traceable ‘quality-metrics’ in specific applications, input from interested parties in the user and manufacturer community, the stakeholders committee and JRP-Partners is vital. Because SLL are evolving quickly, this interaction has to be as direct as possible. Potential users are often represented through national lighting associations, local and national governments, national architect and light design associations, advertising and consultancy associations, national road safety and transport boards, major national retail channels of in-house lighting products.

In this task the project will:

  • Realise interaction with identified potential users of SSL quality metrics: setting up and maintaining an interaction between the NMIs and interested JRP-Partners via the JRP website
  • Obtain sets of typical SSL products from the user community and manufacturers. A bench marking i.e. a comparison of their stated performances will be performed. The sets will also be used for actual characterisation and evaluation in the various WPs
  • Summarise the developed quality metrics in a report to standard organisation bodies and national governments for implementation

Develop a quality label for SSL measurement equipment

The aim of this task is to develop a quality label for measurement equipment that is used for SSL characterisation. Illuminance meters, array spectroradiometers, integrating spheres, and luminance meters are available for the evaluation and measurement of several SSL–related measurands, but the calibration of measurement equipment is incomplete when referring only to incandescent standards. For example, spectral mismatch classification of illuminance meters works very fine on (broadband) incandescent light sources, whereas on SSL sources, measurement errors larger than expected could be introduced.

In this task the project will develop:

  • A label that will discriminate the sensitivity of measurement equipment to introduced measurement errors when used for SSL product characterisation. This label will benefit instrument performance and improve the measurement uncertainty evaluation.

Energy saving is improved as the performance of the SSL product in its application is optimised more accurately.

Develop general quality metrics for SSL products

The aim of this task is to remove the barriers to the uptake of SSL in EU, through the development of traceable criteria for the full characterisation of sources and luminaires.

In this task the project will focus on:

  • The evaluation of existing guidelines on metrics, measurement conditions, methodologies and uncertainty evaluations
  • Applications of SSL sources where spectral distribution of the light is relevant, such as in Greenhouses
  • Quality metrics of pulsed sources: luminous efficacy, temperature, relative humidity dependence and peculiar measurements problems of pulsed sources
  • Quality metrics for mesopic measurements: mesopic photometric parameters for the correct characterisations of sources and luminaires in applications
  • Colour quality: colour quality parameters, threshold values and background information
  • Safety aspects: possible incompatibility between maximum irradiance/luminance

Develop specific quality metrics for indoor applications

In indoor lighting, energy saving can be achieved through a careful design of lighting installations with efficient light sources and luminaires and considering glare, colour rendering, dimming, colour temperature variations and daylight contributions.

In this task the project will:

  • Evaluate quality metrics, measurement conditions and methodologies, uncertainty evaluations for SSL indoor lighting;
  • Evaluate comfort and pleasantness in different indoor applications
  • Evaluate SSL in colour demanding applications such as museums along a comparative evaluation of colour rendering specifications
  • Evaluate UGR with specific characterisation of luminaires to avoid discrepancies between UGR computations and glare perception.

Develop specific quality metrics for outdoor applications

The aim of this task is to develop and validate specific quality metrics for SSL in outdoor applications. Outdoor lighting and signalling has an impact on safety and style of life (city beautification). Its contribution to the European energy budget is recognised in the 245/2009 EC law. Adaptive lighting systems and mesopic conditions can generate energy savings between 25 % to 40 %.

In this task the project will:

  • Evaluate energy saving and required metrics, defining new parameters to quantify the quality of installation and system design.
  • Develop a guideline to avoid errors and low performance installations when SSL replaces traditional luminaires.
  • Develop and demonstrate an approach to design controlled road lighting systems. These systems would require accurate measurements within 10% and have the potential to save 35% in energy consumption.
  • Evaluate lifetime of LED luminaires in terms of important metrics in actual atmospheric conditions with traceable mesopic and photopic measurement equipment over a long period of time (winter – summer, north – south, day – night).

  • EMRP