Normally an LED for plants is a 1 Watt bulb array (8 bulbs in a 24" fixture for example). That has 16 so I would assume it is using the 0.065 Watt bulbs for a total of 1.04 Watts... in 3 gallons that should be able to light most plants, without getting into the really light needy plants... trouble will be that they may not be the right colour, I couldn't see the Kelvin rating, should be in the 6500K range for plants.
Smaller tank, lower light, crypts, ( parva crypt , crypt 1 ) java fern would be good choices. They might even grow with just the ambient room light.
That's a pretty small tank for most fish... what are your fish plans... if any?
Jeff.
