The Light Spectrum

The light spectrum refers to the distribution of wavelengths emitted by a light source. Blue and red light play an important role in photosynthesis and the regulation of plant growth, but green light is also useful, as it penetrates more effectively through dense foliage. The effect of the spectrum depends on light intensity, exposure time, and the stage of development. Proper selection of these parameters can improve seedling quality, growth rate, and yield. Lamps should not be selected based solely on light color; it is also necessary to compare PPFD, daily lighting duration, and the uniformity of surface illumination.