Some LED grow lights are nominal full spectrum, which may be to express their rich spectral components. Here is a key concept, that is, how to define the "full" in full spectrum, who defines it, and how wide the wavelength range can be called "full"?
Although the spectrum of sunlight is the most complete, PAR value is only described in the range of 400nm-700nm when studying the photosynthesis of plants under sunlight. Many nominal full spectrum LED grow lights for sale have some UV and IR bands, but they still use PPFD to express parameters. Because PPFD does not describe the UV and IR radiation, the parameter description of full spectrum LED grow lights shows low-level errors.
The wavelength range of LED grow lights is only the definition domain of the spectral absorption efficiency function, not the value domain of the absorption efficiency function. The spectral absorption efficiency is the index to measure the effect of photosynthesis. The spectrum of wide band or multi band is called full spectrum, which can not represent the effectiveness and compatibility of LED grow lights. It is not rigorous to use full spectrum to describe plant lamp, which often misleads the application of growers.
For LED light source, with the same PPFD value, the spectrum shape can be different; For the same PPFD, the PPF value of the light source is different for the secondary optical design; With the same PPF value, the efficiency of lamps is different, and the PPFD value is also different; If PPFD is the same, but the spectral shape is not correct, the planting efficiency is also different.
Even if the above conditions are the same, the plant provenance is different, the growth environment and substrate are different, the planting effect is also different.
In addition, the planting effect of LED grow lights are also affected by environmental factors such as carbon dioxide concentration, ventilation and temperature control. Under the condition that the planting efficiency and quality meet the requirements of planting technology, LED grow lights need manufacturing technology to ensure that the energy consumption index is minimized, which is very important. The complexity of spectral research shows the diversity of current plant lamps. As there is no evaluation standard at present, the grow lights on the market are in full bloom.