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Hi all, i want to build my own led array, and i am in my information gattering fase ;-) There are many things that i still dont understand, but these things bug me most at the moment: How do i calcute the loss and efficiency of a CREE Xlamp CXB3590? How do i calcute lumens ---> PPFD? (the...

Hi all, newbie here! growing marihuana for 2 years now! Hope to find lots of new info here ;-) cheers!