Method of hot restarting a high intensity discharge lamp

Details Method of hot restarting a high intensity discharge lamp Method of hot restarting a high intensity discharge lamp

H - Electricity

05

B

H05B 41/24 (2006.01) H05B 41/23 (2006.01) H05B 41/38 (2006.01)

Patent

CA 2208857

An apparatus and method for operating an arc discharge lamp which can be hot restarted is described. The method involves providing low microwave power after the lamp ballast is disconnected from the lamp. The microwave power is modulated such that conductivity is maintained within the lamp as the lamp cools. Restarting the lamp is accomplished by reconnecting the ballast at any time. In one embodiment, the apparatus of the invention includes an arc discharge lamp and ballast coupled together with a switch to turn the lamp on and off. A microwave power supply is connected in parallel with the ballast and is coupled to the lamp when the ballast is shut off. The invention allows for hot restart of the arc lamp without requiring a high voltage pulse.

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