Investigation of LED street lighting’s disturbances

Power LEDs used in street lighting have many advantages comparing to the widely used high pressure sodium vapor lamps or metal halide lamps. Optical characteristics and white light night vision is better, efficiency is getting better, expected lifetime is definitely higher, but power LEDs need switched mode electronic drives which cause high disturbances both in harmonics and in transients. This paper investigates the emission of harmonics and the transient behavior of lamps in different power system conditions.