A method and system for plant growth lighting. The method comprises accessing a reference growth profile associated with a plant under cultivation. Based on comparing a growth state of the plant with the reference growth profile, a desired intraday growth lighting condition corresponding to the plant growth state is identified. The desired intraday growth lighting condition is correlated with a spectral output frequency signature of the LED growth lighting source. The desired intraday growth condition is simulated by providing lighting including the correlated spectral output frequency signature from the LED lighting source to the plant under cultivation.
