What is the best spectrum
Different plants utilized different parts of the spectrum. Factors that are imprtant:
- Chlorophyll and photosynthesis active chemicals distribution
- Growth phase
- Day/night cycle
- Enviromenthal factors such as temperature, humidity, dust?, water saturation?, ...
- Light shadows from adjacent leafs, LED light beam shape
- LED wear out
- ....
In a many applications the LED array is already given, and it can be
very interesting to optimize the channel power distribution for the given array / properties
Photosynthetically active radiation (PAR) - a measure of the light energy that is used in photosynthesis
- Photosynthetic photon flux (PPF) values all photons from 400 to 700 nm equally
- Yield photon flux (YPF) weights photons in the range from 360 to 760 nm based on plant's photosynthetic response
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