Thanks Volker…
The EMC assessment needs to take into account all normal intended operating conditions of the apparatus. In cases where the apparatus can take different configurations, the electromagnetic compatibility assessment must confirm that the apparatus meets the essential requirements, “in all possible configurations identified by the manufacturer as representative of its intended use”.
..i hate to say it, but that is open to interpretation, and also, it says that it only concerns those conditions identified by the “manufacturer”, and not by the approvals body.
....Supposing that the manufacturer sells the lamp as being for use from 235W to 50W, and knows that it fails mains harmonics at 25w….but still gives the facility for the customer to be able to dim it to 25w…what then?
Also, I would put it to all, that designing a dimmable offline SMPS LED driver which can pass mains harmonics at all power levels from 235W down to 25w, is not economically feasible...would you agree?
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The following offline 600W LED lamp is dimmable down to zero Watts.
I think we can be virtually certain that it doesnt pass mains harmonics levels at 25w power.
-But "operation at 25w power" is not actually stated in its datasheet
https://www.alibaba.com/product-det....normalList.13.24011c94lLiwtl&s=p&bypass=true
...so its perfectly legal , and sells in high numbers throughout the EU. Its not illegal to operate it at 25w.
Perhaps if it was illegal to operate it at 25w (because it fails mains harmonic emission levels at 25W) , then the customer could simply dim it up to 50w, where it may just pass mains harmonics levels….but that would kind of be ironic wouldn’t it?...i mean, a waste of 25w just to operate at a level which passes mains harmonics. –What benefit is that to anyone?