PAR ratings

[Tweak]

Could someone please explain to me what par ratings are, how they are different than lux, and how can we use a rating to increase yield or potency?

[Chefbjy]

DrPhoton has a great article on this. This is takenfrom that page you really should read his articles very informative.

PAR (Photosynthetically Active Radiation) is quite simply the range of light which plants can use for photosynthesis, it is not a measurement system and only defines the range of frequencies used by plants. EMR between 400nm-700nm is light which can be used by plants for photosynthesis. Light outside this range is below the level for which plants can effectively turn photons into usable energy. PAR can be used to set the parameters for measurement systems such as photon counting.

[Chefbjy]

Here's the article. The other ones might answer your other question. https://forum.growweedeasy.com/forum...metric-systems