Question about lights

Why do plants get droopy toward the end of the night in an 18/6 light cycle?

i do mine on 24/0, gets the most outta your plants imo. they shouldn't get too droopy by night time though, it might be a humidity or a watering problem. pics?

when the leaves drop down at night they are sleeping, they have no reason to perk up as there is no light for them to eat

Upload picture could be the fact of you over watering or other problems.

Plants will also droop (relax) when they have had enough to eat for the day. I read up on daily light intregal and ran some tests.

At just over 220 watts/sqaure foot the plant would relax after 15.5 hours of light, dropping the light to 200 watts a square foot increased the time to 16 before droop. Under 150 watts/foot the plant would eat all day. This was a bagseed sativa I still grow.

I personally like the plant responses with the higher intensity light and short cycles, but actual bud yield does not seem to care.

Like a resting human having low blood pressure, an inactive plant has low water pressure, causing the leaves to not stand as straight.

crazymanny00 said:

when the leaves drop down at night they are sleeping, they have no reason to perk up as there is no light for them to eat

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This is 100% correct without giving you a scientific explanation. They perk up at lights on because they are ready to start out their day and eat that sun light.