As described above, the effect of

 As described above, the effect of suppressing noise due to noise current flowing through the  LED Bulb  capacitance and inductance of the path between the components and the interaction of noise suppression significantly changed.

Chip Beads countermeasures LED Module

LED bulbs from July 2012 became the "Electrical Appliance and Material Safety Law" is intended, this article also explain radiated noise countermeasures. This, in a differential mode chokes X capacitor is arranged outside the case, the first measurement of the LED light bulb radiated noise (Figure 11). The results show that in a large frequency range are radiated noise generated, particularly in the 100M ~ 200MHz band, far more than the specified value CISPR15.

Figure 11: LED bulbs are examples of measures radiated noise

  LED Flexi Strip

LED bulbs radiated noise countermeasure use of chip ferrite beads. Different positions of the beads, the radiation noise suppressing effect is different.