I’ve seen many SMPS LED PSUs that are between 12V and 18V. However these ones generate a nominal 60V. This may at first appear a tad excessive until you take into account the size of the panel: 600mm x 600mm. I would think that such a panel contains around 100 LEDs.
At first I attempted to reduce the QRM by clipping ferrite cores onto the input and output leads. This only had the effect of shifting the concentration of QRM.
January 2018: So often we are told that old-
So here’s a thought. Are we simply swapping one form of pollution for another? OK,
LED lights are more efficient and theoretically result in less greenhouse gas production,
but often the circuitry necessary to power them generates so much RF interference
that radio reception in the vicinity is totally wiped out. Have you ever been sitting
at traffic lights in your car, listening to the radio when a bus pulls up next to
you and suddenly all you hear from the radio is ‘static’? That’s LED lighting on
the bus doing that! Personally I don’t think that the policy makers are aware of
this … and even if they are aware, I don’t think they would care. They’re more interested
in the pat on the back they get for their part in reducing our carbon footprint.
If manufacturers were conscientious enough to build the appropriate suppression circuitry
into their LED drivers we wouldn’t have this problem. However, such quality comes
at a price … a price that we don’t want to pay. The far-
Here is a photograph of the offending SMPS … a minimalist approach when it comes
to design … absolutely NO attempt to reduce RF emissions. I think the 3-
The marking on the PSU enclosure states that the current rating is 600mA, which I
confirmed as the maximum current that each panel draws on switch-