11/12/2022
What"s PAR Vaule mean?
Photosynthetically Active Radiation
All LED light manufacturers, show PAR values that are very overstated. Plants use 400-700. Nanometers. Think of it this way
Blue light has wavelengths that are very close together. Police lights are blue for a reason. Blue light is seen by our eyes from long distances, because the tight/short wave lengths take longer to spread out.
Red light has longer, more spend out wavelengths, so our eyes see Red at much shorter distances.
Luke water ripples...
When plants are very young, they need more blue light for the vegetative state to be healthy and vigorous.
When plants are in flowering states, Red is best for ripening and bigger yeilds.
PAR vaules below 400 on the Blue end, and over 700 for Red are useless for Photosynthesis in plants..
Sharimg Wikipedia's meaning of PAR.
Photosynthetically active radiation (PAR) designates the spectral range (wave band) of solar radiation from 400 to 700 nanometers that photosynthetic organisms are able to use in the process of photosynthesis. This spectral region corresponds more or less with the range of light visible to the human eye. Photons at shorter wavelengths tend to be so energetic that they can be damaging to cells and tissues, but are mostly filtered out by the ozone layer in the stratosphere. Photons at longer wavelengths do not carry enough energy to allow photosynthesis to take place.
Other living organisms, such as cyanobacteria, purple bacteria, and heliobacteria, can exploit solar light in slightly extended spectral regions, such as the near-infrared. These bacteria live in environments such as the bottom of stagnant ponds, sediment and ocean depths. Because of their pigments, they form colorful mats of green, red and purple.
We hope this helps. Happy Growing!!
