Different Colored light Effect on plants growth

Wavelength (nm)	Type	Effect
280-320 nm	UV-B	Deleterious for growth.
320-400 nm	UV-A	Might have additive effect to blue radiation.
400-500 nm	BLUE	Necessary for elongation control.
500-600 nm	GREEN	Less important in photosynthesis than red spectral range for certain plants.
600-700 nm	RED	Optimisation is necessary because unoptimised red portion will cause abnormal development.
700-750 nm	IR (Far-red)	Enhancement of flowering & stem elongation.

Cucumber

Blue only or green only irradiation did not cause development. Optimal growth was found when the irradiation of the plants contained 15-20% blue irradiation, rest of the spectrum was balanced with green and red irradiation

Tomato

High productivity requires the dominance of the 600nm-700nm red part in irradiation spectrum. Saturation of the crop yield was achieved with 60-65% red irradiation, the rest of the spectrum was balanced by blue and green irradiation.

Prikupets & Tikhomirov, proceedings of Int. Lighting in controlled environments workshop, Univ of Wisconsin, Madison, Wisconsin, 1994, p31