You say it can drive up to 150 LED's and later you say something about 2 150 strips. Im confused, is it that each channel can drive 150 LED's? (L1, L2). or would you just need 75 (ish) x 2 strips?
I'm pretty sure he means 150 max addressable, so two in parallel would be OK.
However, I too am wondering about the maximum current drive if sinking through L1 and L2. 4A may not be near enough to drive 2 strips, let alone, 3 in triangular formation for no shadowing. It takes a 10A peak battery to provide enough with a direct connection, and even then it only lasts maybe 20 min before needing recharging.
I think the future of string blades is really in the blade tech itself. That is, high brightness/watt with smooth diffusion (no shadowing or corncob effect). Unfortunately, no one has perfected this yet for the mass market. Hoping it will happen soon though, because it's far too cool to ignore.