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Making light of light, in a way...
Dino H. Carter
Making light of light, in a way...
Did you know that lux, lumens & PAR all measure the same visible spectrum of light that we can see?
It can get confusing as I'm sure you've seen but the thing of it is plants don't care about just that range. The old "lumens are for humans" argument can be amusing as many who said that praised PAR which measures the same range. As the tools to more adequately measure what plants actually use and new standards come into play such as UL8800 and getting lights qualified on the DLC SSL QPL new industry buzz phrases and terms have popped up.

To keep it simple you need to know a few things.
You'll see PAR which can also be referred to as PPF (photosynthetic photon flux) but that is still the visible spectrum and then BPF which measures the total range that plants actually use which includes the PAR range (400-700nm) of visible light along with a range below 400nm (UV) and another range above 700nm (IR). If a light has been truly made for horticultural use then the BPF number will be higher than the PAR number. Why? Because BPF includes a wider range of light that includes UV and far reds in addition to the visible spectrum.
Tent grow under Spectrum King LED
The more you know the better informed you can be in your decision making process when buying a light to grow your plants with.
To top off this new lingo cake let's drop the last key detail to know for horticultural lighting which is umol/joule which tells you how well a light converts electricity into photons... What the @#$% is that? An efficiency rating and super important to know for grow lights.The higher the number the better for plants a given light should be. These days anything above 2.5 umol/J is very good.
Remember plants eat light so the healthier does of what they want gets you better results!

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