Patent ID: 8310162

Claim:
A lighting apparatus comprising: a lighting circuit unit configured to activate a light source; a timer unit configured to measure accumulated operation time of said lighting circuit unit; a life judgment unit configured to store a first judgment time and a second judgment time longer than said first judgment time, said life judgment unit being configured to compare said accumulated operation time with said first judgment time and output a first judgment signal when said accumulated operation time becomes equal to said first judgment time, and said life judgment unit being configured to compare said accumulated operation time with said second judgment time and output a second judgment signal when said accumulated operation time becomes equal to said second judgment time; a timing adjustment unit configured to vary timing at which said life judgment unit outputs said first judgment signal and timing at which said life judgment unit outputs said second judgment signal; an indication unit configured to indicate, upon receiving said first judgment signal from said life judgment unit, a first level of the end of life with said light source kept turned on, said indication unit being configured to indicate, upon receiving said second judgment signal from said life judgment unit, a second level of the end of life, and said second level of the end of life is later than the first level of the end of life, wherein said timing adjustment unit is configured to vary said first judgment time and said second judgment time respectively, said life judgment unit being configured to compare said accumulated operation time measured by said timer unit with said first judgment time varied by said timing adjustment unit and output said first judgment signal when said accumulated operation time measured by said timer unit becomes equal to said first judgment time varied by said timing adjustment unit, and said life judgment unit being configured to compare said accumulated operation time measured by said timer unit with said second judgment time varied by said timing adjustment unit and output said second judgment signal when said accumulated operation time measured by said timer unit becomes equal to said second judgment time varied by said timing adjustment unit, wherein said timing adjustment unit is configured to randomly vary said first judgment time within a first variation width and to randomly vary said second judgment time within a second variation width.