Patent ID: 6958581

Claim:
A high-intensity discharge lamp operating device comprising: a power supplier configured to supply power to a high-intensity discharge lamp connected to the power supplier; a memory containing a starter power data set, an identifying power data set and a plurality of steady power data sets; a detector configured to detect voltage applied to the high-intensity discharge lamp; a power supplier controller configured to control the power supplier to control the power supplied from the power supplier to the high-intensity discharge lamp according to the starter power data set, the identifying power data set and one of the plurality of steady power data sets; a lamp power identifier configured to identify a lamp power of the high-intensity discharge lamp based on the voltage detected by the detector while the power supplier controller controls the power according to the identifying power data set after the power supplier controller controlled the power according to the starter power data set; and a data set selection unit configured to select the one steady power data set from the plurality of steady power data sets based on the lamp power identified by the lamp power identifier, the power supplier controller being configured to control the power according to the one steady power data set after the data set selection unit selects the one steady power data set.