Blue light – 400 – 500 nm – blue light is one of the two main factors influencing photosynthesis via chlorophyll. The blue light spectrum is largely responsible for improving plant quality – especially in deciduous crops.

Blue light causes a number of positive properties for the plant:

• causes the length of internodes to decrease, which makes the plants more bushy and compact,
• promotes the opening of the stomatal apparatus – which allows more CO2 to enter the leaves,
• drives the peak absorption of the chlorophyll pigment, which is needed for photosynthesis,
• has a positive effect on the setting of the circadian rhythm,
• produces healthier and richer in nutrients plants.

Red light – 630 – 660 nm – is necessary for stem growth and leaf expansion. This wavelength also regulates flowering, dormancy, and seed germination. Red light is very efficient in producing tall and vigorous plants in a short time.