Cycle, Dark-Light

Cycle, Daylight

Cycle, Light

Cycle, Light-Dark

Cycles, Dark-Light

Cycles, Daylight

Cycles, Light

Cycles, Light-Dark

Dark Light Cycle

Dark-Light Cycle

Dark-Light Cycles

Daylight Cycle

Daylight Cycles

Light Cycle

Light Cycles

Light Dark Cycle

Light-Dark Cycle

Light-Dark Cycles


The time period of daily exposure that an organism receives from daylight or artificial light. It is believed that photoperiodic responses may affect the control of energy balance and thermoregulation.