the_bot
September 22, 2023, 7:23pm
10
i know bunch of grows that list their lights/diodes.
theres some info below but in general, just look for a LM301h (or b) diodes (Samsung). Theres chinese, theres american made. theres debate. all work fine. HLG, Meiju, Atreum, AC Infinity, Vipar, etc etc.
latest content update: Sep 4, 12022
BRIEF
this is what I use to organize my notes - I wanted to share it.
this is a work in progress and if you want to chip in with your own information, please do so.
this is my journal .
The notes are divided as follows:
A. ON BOTANY
B. ON PRE-PLANNING (genetics, par light, envir, method & medium, and fertilization)
C. ON GROWING (techs, veg, flower, harvest, cure, issues and pest mgmt)
D. ON POST PROCESSING (decarb, edibles, hash and other con…
II. LIGHT
This only applies to LED. I do not research HPS.
PAR light and Spectrum
PAR means photosynthetically active radiation. PAR designates the spectral range (wave band) of solar radiation that photosynthetic organisms are able to use in the process of photosynthesis - in other words, the specific light spectrum (specific wavelengths) that cannabis will use for photosynthesis.
Solar light has a spectrum of 300nm to 800mm. Of that range, it is usually considered that PAR light falls between 400nm (blue) to 700nm (red), yet there are studies that indicate that some ultra violet (UVA 315-400 nm) and far red (700 - 800nm) light affect trichome production and photosynthesis.
Efficiency VS Spectrum
According to research by Dr. Bruce Bugbee from the Utah State University, roughly speaking - if everything else is stable, the amount of light provided will dictate the quantity of your yield. Efficiency (micro-mol per joule) will generally be more important than spectrum when it comes to yield. Choosing an efficient light is essential.
It is important that the LED manufacturer is straight forward regarding the real wattage and efficiency of the light, the diodes it uses, and the spectrum.
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