For lamping you need to take the image you have and save that as 'off' image. Then take that 'off' image and use Photoshop or Gimp, something along those lines that allow you to lasso each lamp, then add lighting effect to each individual lamp and save as on image.
It's a laborious job the first couple of times, but after a while it's quite satisfying.
Fair play to you though, only just joined and already having at it, kudos to you.