SP150 has more blue in the spectrum, it doesn't seem dimmable and capable of daisy chaining, and i believe they don't use Samsung diodes like the SP3000. Not sure about the driver either.I'd get two Sp150s and a tent for the price of an sp300...$ 277 and a tent for $75 is a good deal for me, but I have no business buying another light or tent!!! It's hard to pass up a good deal though!!!
Mars Hydro SP 3000 Samsung LM301B Osram 300W LED Grow Light
www.mars-hydro.com