Answer: Plants, like people, need a rest period each night. If you leave the lights on all night you'll force the seedlings to grow and work hard at converting light into carbohydrates 24 hours a day. This will result in spindly, weak seedlings. Turning the lights out at night will provide your plants with a needed rest period so they can recuperate from the day's events and be ready to grow in the morning. 14-16 hours of light is plenty for your little seedlings and will result in stout, sturdy plants, capable of growing and producing flowers and fruits.
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