The objective of this paper is to prove the relationship between the Total
Harmonics Disturbance emission of lamps network and the number of lamps. In the lighting
field the LED lighting emission diode is the absolutely winner. The low power consumption
and the characteristics of LED made it ideally for most of indoor and outdoor applications.
The dimmability of the LEDs which is between 0% and 100% made it ideally for intelligent
lighting applications. This large dimmability range could be obtained only with
incandescent and halogen bulbs, compare to CFL compact fluorescent lamps where the
maximum dimmability is around of 60%. One of the prices of this positive characteristics of
modern lamps, is the electromagnetic compatibility EMC. It is well known that the modern
lamps have a common part, and this is the electronic ballast. And as all electronics circuits,
the electronic ballasts are an important source of EMC noise emission. The noise emission
of electronic ballast is mainly conducted emission type. Start from construction of
electronic ballast which contains an AC/DC converter and a buffer capacitor the emission
of half harmonics is presented too. The emission of half harmonics is proportionally with
the cost of lamps, because the cost of lamps depends by the methods used for noise
emission rejection too. Typically the cheaper lamps have a higher noise emission than the
expensive lamps. Known of noise emission lamps separately is not enough for
characterization of low noise emission from lighting network. The low frequency noise
emission of a lighting network is lower than in case of a single lamp. The variation of
temperature determines a variation of low frequency noise emission too.


EMC, CFL, LED, Total Harmonic Distortion, EMI filter, conducted noise emission, electronic ballast, half-bridge inverter

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