Fig. 4From: Optimizing the photon ratio of red, green, and blue LEDs for lettuce seedlings: a mixture design approachResponse surface methodology (RSM) results based on the shoot fresh weight of mature plants treated with white LEDs for 4 weeks of cultivation after 2 weeks of 10 light treatments; a contour plot (A) and three-dimensional image (B). Yellow dots in A and B show optimal points on response surfaces for shoot fresh weightBack to article page