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Horticulture

LED lighting improves sustainability for specialty-crop producers

For about 2,000 years – since Roman emperor Tiberius demanded fresh cucumbers for lunch year ‘round – farmers have been looking for better ways to extend the growing season. Now, a team of researchers led by Purdue University has found a way to grow more produce and save money doing it.

Greenhouses and other structures protect crops from harsh environmental conditions. Over the last 50 years or so, some growers have added artificial lighting to compensate for shorter winter days or when conditions are cloudy. However, the problem with most lighting systems is that they are relatively costly to install and do not provide the light spectrum that is most efficient for photosynthesis in plants.

The Purdue-led team of academic and industry scientists from Wisconsin, Michigan, and New Jersey is investigating the use of light emitting diodes (LED) to address this problem. The researchers have designed LEDs that produce the exact light quality plants need to thrive while using only a fraction of the electricity used by high-pressure sodium lamps—the current industry standard. In experiments in West Lafayette, IN, the team’s LED systems used 75 percent less electricity to produce the same product yield. There are currently about 4,200 acres of greenhouses in the United States that use supplemental lighting. If LED systems were installed in each of these greenhouses, energy use could be reduced by 3.5 billion kilowatt hours. According to the U.S. Environmental Protection Agency, a reduction of that much energy would reduce carbon dioxide emissions by almost 3 million tons per year.

 

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