| http://www.w3.org/ns/prov#value | - FIG. 7 is a graph showing the light quantity of the lamp and a lamp voltage for a first control voltage when the halogen lamp rated 100W is driven in FIG. 6, in which the axis of abscissas shows the first control voltage, the left axis of ordinate shows the lamp illuminance (luxes or Lx), and the right axis of ordinate shows the lamp voltage, the solid line indicates the change in the lamp light q
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