A number of researchers have conducted in-depth studies that demonstrate the benefits of proper dosage of LED light in specific wavelengths.
For example, a study conducted by Wageningen UR Greenhouse Horticulture studied several tomato varieties and various intensities of light. They found that certain varieties of tomatoes that receive extra light from LED grow lights contained up to twice as much vitamin C as the tomatoes not exposed to the LEDs.
Another study, published by Japanese researchers in 2012, demonstrated an increase in a particular antioxidant in mandarin oranges when plants were exposed to red (660nm) light.
In yet another study, scientists found that a pre-harvest LED light treatment was found to remarkably enhance antioxidant and nutritional properties of particular green vegetables due to the increased activity of the metabolic system for the protection from a mild photooxidative stress. Application of supplemental LED lighting to dill and parsley, for example, resulted in the accumulation of vitamin C and carbohydrates and in the enhancement of free radical binding activity and the activity of nitrate-reducing enzyme, according to this study from Vilnius University in Lithuania.
In a study from the University of Florida published in 2013, Thomas Colquhoun demonstrated that fruit volatile profiles of tomato, strawberry, and blueberry can be manipulated with specific light treatments. (Volatiles are the chemicals emitted by a piece fruit that allow you to smell and taste it. These compounds are really important in providing flavor to fruit and vegetables.)
The Florida researchers also found that post-harvest food stored under LED lights improves in appearance and flavor.
More work on the potential of LEDs to improve flavor and nutrition is ongoing, with a number studies in progress. But the evidence, even now, is strong enough to have convinced numerous growing operations around the world to switch to LED lights in their operations.
– See more at: http://www.illumitex.com/food-grown-led-lights-tastes-better-better/#sthash.wYA7VXDY.dpuf