Abstract: A method for increasing floral yield of a flowering plant includes positioning the plant between side lights at the onset of a flowering stage of the plant, such that the plant is flanked by the side lights. The method also includes irradiating lateral sides of the flowering plant along the total height via the side lights with light in a predetermined red spectrum range for a duration of the flowering stage, such that at least 80 percent of the light has a wavelength of between 580 nm and 780 nm. The plant may be positioned between first and second sets of equally-spaced elongated side lights on respective first and second lateral sides of the plant. Supplemental lighting devices may be attached to the plant, with an interior of the plant irradiated with the red spectrum light for the duration of the flowering stage using the lighting devices.

Abstract: A method for increasing floral yield of a flowering plant includes positioning the plant between side lights at the onset of a flowering stage of the plant, such that the plant is flanked by the side lights. The method also includes irradiating lateral sides of the flowering plant along the total height via the side lights with light in a predetermined red spectrum range for a duration of the flowering stage, such that at least 80 percent of the light has a wavelength of between 580 nm and 780 nm. The plant may be positioned between first and second sets of equally-spaced elongated side lights on respective first and second lateral sides of the plant. Supplemental lighting devices may be attached to the plant, with an interior of the plant irradiated with the red spectrum light for the duration of the flowering stage using the lighting devices.

Abstract: A method for increasing the yield of a flowering plant includes positioning a lighting device with respect to a lower minor height of the flowering plant, i.e., at a height of less than half of the plant's total height. The method includes irradiating the lower minor height of the plant with light in a predetermined range of the electromagnetic spectrum for a duration of a flowering stage of a life cycle of the flowering plant. The lighting device may be an annular clamshell design that circumscribes a stalk of the flowering plant. Such a design may be clamped to the stalk via a spring force of a pair of spring-loaded clamps. The lighting device may include a plurality of ref LEDs arranged in an arcuate manner. At least 80 percent of the light from the lighting device is in the predetermined range of 580 nm to 780 nm, and may be in the range of 600 nm to 700 nm.