First off: I'm new to these forums, so nice to meet everyone. Glad to be here. Been in the hobby a couple years now. Current tank is a 50 rimless cube.
Now to your question: no unfortunately. A 2 bulb t5 fixture won't support light demanding corals or inverts. If money is a issue I would suggest saving up for the lighting that you need if you truly want to keep light demanding corals. Otherwise you'll just waste money in the interim watching your frags brown and die.
My other suggestion (if you have no lighting currently): take what money you were going to spend on parts to use those ballasts and buy a cheaper 4 bulb t5 fixture and throw the bulbs away, put some quality t5 bulbs in it like ati. Put that over your tank and enjoy while you decide if keeping sps corals is even for you. Start a birds nest or monti digi and see how you like it. If you catch the acro bug, start saving for more light.
That's my .02, don't waste time and money piecing a pc system together. And don't go with nothing at all because you can't have what you think you want.
Also an FYI: led manufactures sometimes under-estimate what you need for full good coverage in tanks to lessen the sticker shock of going all led. That's just my observation and not trying to start a discussion here that's off topic. Good luck