Lighting system

A lighting controller for controlling a light source periodically, comprising:

• controlling means for controlling luminance on a light emitting surface of the light source such that the luminance has changes with respect to time which are larger in the vicinity at tMAX than in the vicinity at tMIN, where tMAX is a time when the luminance takes the largest value during one period and tMIN is a time when the luminance takes the smallest value during the one period;
• a first lighting control signal generator for generating a first lighting control signal;
• and
• a lighting control unit for controlling lighting of the light source based on the first lighting control signal outputted from the first lighting control signal generator;
• wherein:
• a lighting term of the light source is divided into at least an introduction stage and a relaxation stage provided after the introduction stage temporally;
• in the introduction stage, the first lighting control signal generator generates the first lighting control signal by which the luminance is varied such that a luminance ratio of a maximum luminance value against a minimum luminance value in the one period becomes substantially constant in a range 10<C1≦100, where the luminance ratio is C1, the maximum luminance value is LMAX1, the minimum luminance value is LMIN1, and C1=LMAX1/LMIN1 in the introduction stage;
• and
• in the relaxation stage, the first lighting control signal generator generates the first lighting control signal by which the luminance is varied such that a luminance ratio of a maximum luminance value against a minimum luminance value in the one period becomes substantially constant in a range 6<C2≦100, where the luminance ratio is C2, the maximum luminance value is LMAX2, the minimum luminance value is LMIN2, and C2=LMAx2/LMIN2 in the relaxation stage.

A lighting controller for controlling a light source periodically, comprising:

• first controlling means for controlling luminance on a light emitting surface of the light source such that the luminance has changes with respect to time which are larger in the vicinity at tMAX than in the vicinity at tMIN, where tMAXis a time when the luminance takes the largest value during one period and tMIN is a time when the luminance takes the smallest value during the one period;
• second controlling means for controlling the luminance such that a luminance ratio of a maximum luminance value against a minimum luminance value in the one period becomes substantially constant in a breath adjusting stage of a lighting term of the light source, where the luminance ratio is C4, the maximum luminance value is LMAX4, the minimum luminance value is LMIN4, and C4=LMAX4/LMIN4 in the breath adjusting stage;
• and
• third controlling means for controlling the luminance such that a luminance ratio of a maximum luminance value against a minimum luminance value in the one period becomes substantially constant in an acclimatization stage of the lighting term of the light source, where the luminance ratio is C5, the maximum luminance value is LMAX5, the minimum luminance value is LMIN5, and C5=LMAX5/LMIN5 in the acclimatization stage, and the maximum luminance value in the acclimatization stage is varied corresponding to a predetermined dark adaptation curve.