Methodology

Topten.eu presents the most energy efficient luminaires for offices and other indoor use. The listed luminaires are certified by MINERGIE®, a Swiss label most famously known for building standards. Each brand is represented with their most energy efficient model per category. The complete list of Minergie-certified luminaires can be found under www.toplicht.ch (website available in German).

Technical Criteria

The standards for Minergie-certified luminaires apply (detailed description in German here). The most important criteria are:

Typology

Only luminaires with LED light sources are accepted

Efficiency

The efficiency requirement of office luminaires is based on the following Minergie formula:

The minimum efficiciency requirements for the different luminaire types are listed in the Annex of the Minergie Label Regulation.

In the figure below is a sample efficiency curve plotted for one luminaire type:


Power in standby mode

(Based on the Energy Star luminaires specification v2.1 2017)

Glare

Unified Glare Rating UGR in standard room according to MINERGIE: max. 25

Additional criteria

Test laboratory

The test laboratory must be accredited by the responsible public authority

Data sources

Product information from Minergie / www.toplicht.ch.

Order of presentation

Models are ranked according to their luminaire efficiency factor in lumens per watt (lm/W); the higher the value the better. The order of presentation can be changed by clicking the tables’ headings.

Glossary

Brand, Model

Brand with link to manufacturer website, name of model

Power

Measured value for power in watts (W)

Lamp category

Only luminaires with LED light sources are accepted

Options for lighting control

Downward flux

Percentage of downward flux (%)

Luminaire efficiency factor

Ratio of the measured luminous flux of the luminaire (lumens) to the power (watts). The higher the value the better. The luminaire efficiency factor (lumens per watt, lm/W) corresponds to the product of the luminous efficacy of the light source (lm/W), the efficiency of the ballast (%) and the light output ratio of the luminaire (%).

Infoplus

Publications

Standards and labels

 

10/2018 Rothwell/Geilinger/Gasser