Abstract: Horticultural lighting devices and methods are disclosed herein. The methods include generating an LED-based horticultural light spectrum at a radiant flux. The horticultural lighting devices include a light fixture configured to receive and to operate plural light-emitting diodes (LEDs). The horticultural lighting device also includes a plurality of LEDs, coupled to the light fixture, that generate a radiant flux. For both the methods and the horticultural lighting devices, 7%-15% of the radiant flux is from light with wavelengths in a blue light band of 400 nanometers (nm) to less than 500 nm, 20%-40% of the radiant flux is from light with wavelengths in a green light band of 500 nm to less than 600 nm, and 45%-60% of the radiant flux is from light with wavelengths in a red light band of 600 nm to less than 700 nm.