I think the light you described will be sufficient to keep it reasonably healthy through the winter months, although it is best if you can keep your plant close to a sunny window that is supplemented with the artificial light. Your plant will need a minimum of 8 hours of light every day and 12 is preferable. The artificial light should be as close as possible to the plant, but not close enough to burn the leaves.

In the photo it looks like you are using a lamp on the floor. Perhaps that was just for the photo, but I just want to make sure you understand that the light receptors in plant leaves are on the top sides of the leaves so light from below is of little value to the plant.

I don't think there was any grafting on your plant. It is unlikely to produce fruit under artificial light. Be patient.