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Why is diffused light best? How does light diffusion affect plant growth? Plants create food from light so the type of light they receive is important. Plants exposed to direct light (no diffusion) produce a majority of their food from the top leaves facing the sun. The select leaves absorbing the sun energy do most of the work while the shaded leaves do very little. Direct light also creates excessive heat which causes plant stress. When a plant is immersed in diffused light, all the leaves can photosynthesize resulting in more food production and healthier, fuller plant development. In addition, the upper leaves of the plant receive less intense light which means they will not suffer from plant stress caused by sun burn and excessive transpiration.
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