I have the Spec V and I can confirm that the stock light is barely enough for low-light. That doesn't even speak to the fact that it actually looks dim- the tank doesn't pop. Only when all ambient light is off does it really look worth of a planted tank with its stock light.
All it needs is a light upgrade to bump it into the solid low-light/low-medium light range. I went with the 16" Fugeray which will (still in the mail) give me about 30 PAR at the 12" depth level. I'm at about 11" so I'm looking at closer to 40 PAR - still firmly in low light range.