1.Plant light requirement
The specific needs of plants determine which lighting is best for optimal growth, and artificial light must mimic the natural light that is best for plants. If a plant doesn't get enough light, it won't grow, no matter what the other conditions are. For example, vegetables grow best in full sunlight and thrive indoors, and they need the same high level of light, while leaf plants (such as tendrils) grow in shade and can grow normally in lower light levels.
The way the lights are used depends on the stage of growth. In general, it is recommended that plants receive 16 hours of radiation and 8 hours of rest during the seedling/growth stage; The nutrition stage received irradiation for 18 hours, 6 hours of rest time; Irradiation for 12 hours and 12 hours of rest during the flowering phase.
In addition, many plants also need darkness and photoperiod, an effect called photoperiod, to trigger flowering. Therefore, the switch can be turned on or off at a set time. The optimal photoperiod ratio depends on the type and type of plant, as some prefer long and short nights, while others prefer opposite or medium days.
Photoperiod is very important in the discussion of plant development.
Plants that respond to photoperiods may have facultative or specific responses. The part-time response means that a plant will eventually run out of flowers, regardless of the photoperiod, and flowers will grow faster in a given photoperiod. Professional response means plants will only grow flowers under certain light conditions.
They are usually used to measure the brightness and lumen of light, but they are units of luminosity that measure the intensity of light perceived by the human eye.
The spectral level of light available for optical cooperation is similar to but not identical to that measured by lumens. Thus, when measuring the amount of light a plant receives for photosynthesis, biologists usually measure the amount of photosynthetic effective radiation (PAR) a plant receives. PAR represents the spectrum of solar radiation from 400 to 700 nanometers, which typically corresponds to the spectrum that photosynthetic organisms can use during photosynthesis.