hey DH! nice setup! the nh4 is usually not a good idea in any form of hydro or automated soilless. but that is a low amount so it may work out ok. it could be responsible for the color change.
i'm looking hard at led's now.
nice work!
thank you. means a lot coming from the master
once i get this system dialed i will try and get a proper side by side of LED v HID