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Grow Lights - An In Depth Look
When it comes to grow lights one will find there is a lot to know and so many different types of grow lights out there, so how does one decide on what light to choose or even decide if the light you want is good or why one light is better than another? To do this we need to have a standard that can be used to compare lights and this is what we refer to as PAR (Photosynthetic Active Radiation), PPF (Photosynthetic Photon Flux) units are umol/s and PPFD (Photosynthetic Photon Flux Density) units are umol/m2/s. But what...