Investigation on HID lamps impedance using commercial lamps

This paper provides some study results on high pressure discharge lamps impedance behavior. Using commercial High Intensity Discharge (HID) lamps first supplied with a current driven dimmable commercial electronic ballast, lamp impedance variation as a wattage function was investigated. Further measurements were done in order to verify that the lamp has a linear comportment within its normal operation window. Lamp was then supplied with a system approaching a voltage source. From these results, qualitative understanding and related conclusions about lamp? supply interaction can be drawn.