Effects of different LED light wavelengths on the growth and antioxidant activity of red cabbage microgreens (Brassica oleracea L. var. capitata subvar. rubra)

This study aimed to determine the effects of LED lights with different wavelengths on the growth parameters, fresh weight, and total antioxidant content of red cabbage microgreens (Brassica oleracea L. var. capitata subvar. rubra) grown under controlled conditions. The experiment was conducted using a fully automated plant growth chamber, named “Confetti Cabin”, with four light treatments: red LED, blue LED, red+blue LED, and a natural light control group. The study was designed with a randomized plot design and three replications. The highest stem length was observed under red LED light (59.28 mm), the highest fresh weight under red+blue LED (90.70 g), and the highest antioxidant content under blue LED (0.99 EC50 µg/mL). The findings suggest that light spectrum selection can be optimized based on production targets in microgreen cultivation.