A discharge lamp lighting device for AC lighting has PT(21), CT1(22), a fluctuation detection circuit (28), and a control circuit (36). PT(21) detects a voltage to be supplied to a HID bulb (5) and CT1(22) detects a current to be supplied to the HID bulb (5). The fluctuation detection circuit (28) generates...http://www.google.ca/patents/US6703798?utm_source=gb-gplus-sharePatent US6703798 - Discharge lamp lighting device
