- New classes of energy efficiency
The standard proposes a new formula for energy labeling that better reflects energy efficiency and is more intuitive in the calculation than the energy efficiency index established in the current regulation on energy labeling.
In the new metrics, the limits for the energy efficiency classes are defined directly in terms of the efficiency of the light source, as a result of the total light output of a light source (in lumens, lm) divided by the mains power (230 V ) input (in Watt, W) and expressed as lm / W.
This change implies that to obtain a given class of energy efficiency, light sources with a high light output do not need a higher efficiency than light sources with low light output. This is reasonable, considering that when the new energy labeling requirements start to apply, the label classes will mainly aim to differentiate LEDs based on their respective efficiencies.
Class limits are proposed with a difference of 25 lm / W between consecutive classes: all light sources above 210 lm / W are of class A. All light sources below 85 lm / W are class G.
As of June 2018, there are no light sources on the market able to meet the efficiency limits of classes A and B (but there are laboratory-based). So these classes would initially be empty, as required by Regulation (EU) 2017/1369. The best LED light sources typically used for domestic use on the market today would have the new E-class label; the best LED light sources for professional use on the market today would be class D and in 2021 some would be class C. In 2021, when the new classes begin to apply, class A should still be empty while some sources may already be class B lights on the market.