Plants’ demand for light is mainly embodied in three aspects of light radiance (intensity), photoperiod, and spectral distribution, which is also called the “light environment” for plant growth.
Compared with traditional plant grow lights (fluorescent lamps and high-pressure sodium lamps), LEDs can adjust the spectrum and radiation intensity according to needs. Secondly, LEDs are cold light sources that can illuminate plants at close range without causing burns; again, LED light sources The small size helps reduce the height of the cultivation layer and increase the cultivation density per unit space. Therefore, LED grow lights technology has been widely used in the field of agricultural lighting.
Artificial light environment lighting design elements
Photon flux density (PPFD, unit: μmol/s/m2): The number of light quanta per unit leaf area per unit time, which is consistent with the unit of photosynthesis rate and has a great impact on plant biomass and its growth rate influences.
Through the spectral distribution, the morphology and color of certain genotypes can be effectively adjusted.
The flowering time of some short-day and long-day plants can be effectively controlled by photoperiod or light duration.
These parameters are not independent or unique, but all these factors work together to regulate the overall growth of plants.
It is well known that factors such as temperature, humidity, root zone temperature, wind, moisture, nutrients, and oxygen/carbon dioxide levels play an important role in regulating plant growth. In addition to these factors, the light also plays an important role in the growth cycle of plants. Since the start of cultivation, all varieties of crops, flowers, and herbs have been cultivated in the sun. Therefore, the intensity, spectrum, and duration of sunlight affect their morphology, growth, and flowering in a natural way.
