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            18-6 photoperiod
18 hours of light and 6 hours of darkness. The light cycle begins with the dark phase.
18-6 photoperiod
18 hours of light and 6 hours of darkness. The light cycle begins with the dark phase.
              
            8-16 photoperiod
8 hours of light and 16 hours of darkness. The light cycle begins with the dark phase.
8-16 photoperiod
8 hours of light and 16 hours of darkness. The light cycle begins with the dark phase.
              
            10-14 photoperiod
10 hours of light and 14 hours of darkness. The light cycle begins with the dark phase.
10-14 photoperiod
10 hours of light and 14 hours of darkness. The light cycle begins with the dark phase.
              
            24-0 photoperiod
With a 24-0 photoperiod, the light is on continuously.
24-0 photoperiod
With a 24-0 photoperiod, the light is on continuously.
              
            0-24 photoperiod
With a 0-24 photoperiod, the light is constantly dark.
0-24 photoperiod
With a 0-24 photoperiod, the light is constantly dark.
              
            12-12 photoperiod
12 hours of light and 12 hours of darkness. The light cycle begins with the dark phase.
12-12 photoperiod
12 hours of light and 12 hours of darkness. The light cycle begins with the dark phase.