DrMcSkunkins
Dabbling in Oil
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Par is the measurment of the lights color wavelenght and only includes 400nm to 700nm wavelengths, plants use light outside those wavelengths so looking at those numbers wont help you choose a good light. What you want is a light with a high ppfd rating thats measured in ųmols.
It doesn't really work that way. It won't necessarily double your par it depends on the angle of the Lens a higher par may just mean more concentrated well a lower par could mean a wider spread. Or you could have a widespread with a super high par. The big question is how much do you want to spend