How Sole-source LEDs Impact Growth of Brassica Microgreens (image) American Society for Horticultural Science Share Print E-Mail Caption This is a photo of mustard microgreens grown under sole-source (SS) lighting using light-emitting diodes (LEDs) with a light ratio of red:green:blue 74:18:8 (R74:G18:B8). Credit Photo courtesy of Joshua Craver. Usage Restrictions None Share Print E-Mail 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.