layout | title | header | permalink | keywords | markdown | |
---|---|---|---|---|---|---|
page |
Energy efficiency |
Energy efficiency |
energy-efficiency/ |
|
true |
{% include JB/setup %}
It might be hard to find how labels E, D, C, B, A, A+, A++ are actually calculated. Herefore we created a small tool using the documents available from the European Union; regulation No 874/2012 in particular. (Scroll down to get to the actual calculations.)
The columns contain the following information, the first three of which are inputs:
- Stated power by the manufacturer.
- A correction factor (with LEDs this is normally equal to one, except if the driving circuitry is separate from the LED).
- The luminosity of the light (in lumen).
- The calculated corrected power.
- The reference power through a calculation depending on luminosity.
- The Energy Efficiency Index (EEI).
- The label that corresponds to this energy efficiency index. For example A++ corresponds to an EEI smaller than 0.11 for non-directional lamps (our case).
Do not get too wind up about exact labels. Although the difference in A+ and A++ is still significant in terms of energy efficiency, it does not touch upon lifetime or other aspects of the product.
<iframe width="100%" height="250px" src="https://docs.google.com/spreadsheets/d/e/2PACX-1vRkvQJy6mTLbmcdnViEfKs8OI_ORzikqb3Y_z0c_5v9bM2pCXV8porvdSVrisAw_8DGQqrXnQsH5qzo/pubhtml?gid=0&single=true&widget=true&headers=false"></iframe>Go to the Google spreadsheet to play with values yourself. You will see that labels stated by webshops are often not right!