High watt type ceramic metal halide lamp illumination device

A high watt type ceramic metal halide lamp illumination device comprising:

• a ballast for receiving a primary input voltage and outputting a secondary voltage;
• and
• a lamp being lighted by receiving the secondary output voltage from said ballast,
• wherein said lamp has a plurality of relatively low output arc tubes electrically connected in series inside an outer bulb and being lighted simultaneously, instead of a high watt type arc tube,
• the secondary output voltage from said ballast is that
• (a) an effective-value Veff is greater than the total sum of glow discharge sustaining voltages of said relatively low output arc tubes,
• (b) a maximum-value Vmax is greater than the total sum of arc discharge transition voltages of said relatively low output arc tubes, and
• (c) a waveform thereof has a maximum-value Vmax and effective-value Veff which are decided on the basis of a ratio of arc discharge transition voltages and glow discharge sustaining voltages of said relatively low output arc tubes, said ratio satisfying a maximum-value to effective-value ratio (Vmax/Veff)≧30.5.