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One would have to observe the plants and determine the plant(s) that close up last and tailor the photo period to the needs of the late closer. Once determined set the time for slightly shorter period and then you would maximize the time the lights are on and not be lighting unnecessarily.

This optimal period would probably vary from tank to tank taking into consideration lighting type and intensity and a other growing conditions, including but not limited to, CO2 levels and available nutrient levels.
 
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