Measuring lettuce plant yield (IMAGE) Purdue University Caption Fatemeh Sheibani measures the yield of lettuce plants grown in a controlled environment chamber using LED lighting. Sheibani is a PhD candidate in Purdue’s Department of Horticulture and Landscape Architecture. Credit Purdue Agricultural Communications Usage Restrictions This image may be used by news organizations in reports referencing Purdue University’s LED vertical farming research. License Original content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.