Comparative results of locusts visual response to 100-10000 lx blue light between after 1000-64600 lx orange light stimulation and no orange light. (a) D-value at 0-0.5 m, (b) D-value at 0-1.0 m, (c) D-value at 0-1.0 m, (d) D-value at 0-1.5 m.