Thanks, i would have to be honest and say the simulations were just provided as a kind of general reference, rather than being the central points of the question......its possible to run them, and fiddle with the power levels, and note the significantly worsening of harmonics when at the lower power of 25W.
Thankyou for pointing out that i didnt run the sims long enough....in fact, they take ages to run on my PC, and also the general point i am making is just that its not economically feasible to make a offline SMPS LED driver which passes mains harmonics at maximum power, and also at 25w, if the maximum power is > around 120W or so.
Even if one believes that it is possible to produce an offline SMPS LED driver which could pass mains harmonics at let's say 100W and 25W…..we all have to admit, that there is a certain maximum power level, whatever it may be, where it can pass mains harmonics at that maximum power level, but not at 25W….for you, this “maximum power level” may be 100W, 200W or 300W, or more…..but we all admit that there is a hard limit somewhere. I very much doubt that many people would expect it to be economically feasible to pass mains harmonics at 250W and at 25W……not with any economically feasible topology.
–The conducted EMC filter capacitors would simply be too large and would distort the waveform too much at 25W….resulting in mains harmonic failure at the 25W level.
If you say its possible to do it at 250W and 25W…then where is your limit?...i can’’t be much higher than 250W.