Post questions in the right forum and you may get a responce.

Whats a plant growth light?

And for 2 plants, you aint going to have enough.

Work it out to at LEAST 100 Watts in each plant and extra sidelighting.

Make sure the bulbs you are using have a high lumen output and make sure they are the right spectrum.

The amount of light you have at the mo might give you a cuple of grams, but its so little it wouldnt be worth it. If your going to do it do it right.