European Union Energy Label - Light Bulbs - Calculation

Calculation

Incandescent and fluorescent lamps with and without integrated gear can be divided into energy efficiency classes. The division of household lamps made in the EU Directive 98/11/EC of 27. January 1998 and also includes lamps that are not marketed for use in the home. Excluded are inter alia Light sources with more than 6,500 lumens (300 watt halogen or 70 watt fluorescent lamps) and those that are not operated on line voltage. To determine the energy efficiency class, proceed as follows (Φ means the flux in the light Lumen (lm) and P is the power consumption of the lamp in watts (W)):

Lamps are classified into class A if:

Fluorescent lamps without integrated ballast, are classified into class A if:

The classification in the energy efficiency class B-G is based on the percentage (Energy Efficiency Index) at the reference power

P_\mathrm{R} = \begin{cases}
0.88\cdot\sqrt{\Phi}+0.049\cdot\Phi&(\Phi>34\mbox{ lm})\\
0.2\cdot\Phi&(\Phi\leq34\mbox{ lm})
\end{cases}

about the power consumption of a standard light bulb with the same luminous flux.

The allocation of energy efficiency index for energy efficiency class indicated in the foregoing section.

Read more about this topic:  European Union Energy Label, Light Bulbs

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