Figure 4.

LD plants and flowering control. Yellow color represents daylight or lighting and black color the night or dark induced by covering the plants LED light with emission at 730 nm converts the Pfr into Pr and induces the flowering of LD plants, overcoming the critical time threshold. On a biochemical level, right graph, short (flash) lighting induces night break and increases the Pfr level, and the induction of LD plant flowering occurs when the Pfr level exceeds a critical concentration threshold.