03-05-2012, 12:13 PM
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As a comparison (since I've looked into the LED lighting thing) an 18" T8 6500K fluorescent bulb is 700 lumens.
So with two of those LED fixtures giving you 1600 lumens I'm thinking could be low light for a 75 gallon. Unfortunately, lumens don't exactly mean a whole lot in aquarium lighting. You would need a PAR meter, which are extremely expensive. So really, all we can do is guess.
I have Wisteria though, and when bought it too was the emersed form. The curling of the leaves is exactly what mine did. At three weeks though, have you seen new growth on the top? And roots coming out of nodes? You should see at least some, even in low lighting (like I had).
The submerged form of Wisteria is pretty much completely different, they almost look absolutely nothing alike.