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Ultra Efficient Lighting & LENI

The recognised industry measurement for the overall system efficiency of an installation is W/m2/100 lux.

PhotonStar LED luminaires are uniquely designed from chip level up for optimum light extraction, with each component being specifically designed for this  purpose. This results in improved photometric performance (utilisation coefficient), meaning fewer fittings per application and optimum overall  system efficiency (W/m2/100 lux).


Definition of Ultra Efficient Lighting (UEL)

It is well known that for ultimate energy efficient lighting we need the right lighting, in the right place,  at the right time, installed and operated by the right lighting system.

Accepting this leads to the following definitions:

Ultra efficient lighting (UEL) means the lighting scheme/design needed to fulfil the lighting requirements specified in the relevant lighting application standard. The resulting installed scheme will use an energy efficient lighting system consisting of lamps/light sources, ballasts, luminaires and lighting controls to deliver the scheme lighting requirements without increasing the environmental impact.

To qualify as UEL, the energy efficiency of the system shall be in the top 20% of lighting energy efficiency ratings of installations made is in accordance with BSEN 15193 LENI estimation (measured in units of  kWh/m2/year) for indoor lighting or BSEN 13201 for outdoor lighting.

Lighting scheme design means a design process in which the lighting designer selects the lighting criteria for the task, chooses the lighting solution (including the use e.g. of day-lighting where appropriate), makes lighting calculations, configures the layout, produces drawings of the lighting scheme and specifies the operating functions of the lighting system. The lighting designer should ensure that the scheme is fully compliant with all current regulations and standards, with particular reference to the Society of Light and Lighting’s Code for Lighting.

Lighting system means the lighting equipment or lighting solution (lamps/light sources, ballasts, luminaires and lighting controls) required for the lighting scheme, its installation and operation during  the life of the scheme.

Supplied by the Society of Light and Lighting 


EN 15193 / Lighting Energy Numeric Indicator (LENI)

Energy performance of buildings – Energy requirements for lighting.

This European standard specifies the calculated methodology for the evaluation of the amount of energy used for lighting in the building. It also provides the numeric indicator for lighting energy requirements used for certification purposes, as well as providing a methodology for the calculation of dynamic lighting energy use for the estimated total energy performance of the building.

EN 15193 specifies the calculated methodology and introduces a Lighting Energy Numeric Indicator (LENI) for certification purposes.