Do all G9 LEDs suffer 100Hz Flicker?

So I've just installed a set of G9 LEDs on an existing AC supply. There is a quite noticeable 100Hz Flicker (can be seen if you move something quickly in the light of the lamp).
Obviously larger LEDs don't seem to have this.

Therefore is this a problem with the lamps being low quality (they are a reputable manufacturer's) or are G9s too small to fit the circuitry required to prevent this issue?

Thanks for the help.

 

Welcome to the forums! Your profile is not complete so we don't know where you are located. How are you determining it is a 100 Hz flicker?

 

Thanks. I am in the UK. I am assuming that its flickering at 100Hz because it's powered on a mains AC supply that is 230V 50Hz. But I haven't measured it (and can't really think of how I would...).

 

The flickering you're seeing is at 50hz. You wouldn't see a 100hz flicker.

 

Not really the issue at stake here, but wouldn't it turn off and on 100 times a second as, so far as I understand, a 50hz AC supply is 0V to +230V to 0V to -230V, 50 times per second.

 

Anyone know of a better forum to ask this question on? So that I can get an answer?

 

Depends on whether you have full wave unfiltered rectification (results in 100 Hz) or half wave unfiltered rectification or no prerectification (results in 50 Hz flicker) given just one diode.

Well filtered prerectification (more expensive built in power supply) will result in no flicker. If the light emitting diodes themselves do the rectification of AC (which they do by definition) two diodes may be connected using a simpler power supply to flash alternately for a net 100 Hz flicker. While you might think it is inefficient to not have both diodes flashing the full 100 Hz, the lamp as designed might be unable to dissipate the heat unless either the built in power supply delivers less volts and therefore the diodes give less brilliant flashes at 100 Hz compared with more brilliant flashes at 50 Hz.

Some people notice flicker more than others. Flicker at 100 Hz is very much less noticeable than flicker at 50 Hz even if the power supply is not filtered.

 

Fluorescent, mercury, and sodium lamps emit light for both the positive and negative pulses of AC. Individual light emitting diodes emit light only during the positive pulses and do nothing during the negative pulses. For incandescent lamps, both the positive and negative pulses of the AC current keep the filament hot and for 50 Hz or greater AC frequency, the filament does not cool down between pulses far enough for any flicker to be noticed.

They do make "double" or "tandem" LED units that emit one color of light for the positive pulses and a different color of light for the negative pulses, or that emit a different color of light depending on the supply voltage.