Even at 44w/bulb you would only be pushing ~1.14wpg of T8 light with unknown quality relflectors. A 4' T5 is ~54w, I believe, so that would put you at 1.84wpg with unknown reflector(s) and unknown restrike.
I doubt that You will be able to grow much of a grass foreground with the 1.14wpg, but may be able to pull it off with the added T5. Whether or not C02 would be needed with the 1.84wpg is something that you will have to wait and see, because of the unknown "quality" of the lighting.
Might want to give
AHSupply.com a call and see if a decent light can be retro-fitted into your hood. They have some of the best reflectors and lighting systems around.
Keep in mind that at Low-light/Low-tech things grow pretty slow.
Is this a removable hood or built-in one like the Eclipse deals...?
HTH