Like the others I don’t know the science of it but I have always tried to simulate Mama Nature. 12 – 16 hours of light, the rest darkness.
A larger concern I have with your set up is the distance the lights are from your plants. Being that far away I would think the plants would get very leggy. If it isn’t natural light (outside, natural light in a greenhouse, etc) most folks try to keep the light within a couple of inches of the tops of the plants. They seem to be stockier that way. But hey, if what you have works for you then it is the right way to do it.
Jerry
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