Hey Mutch, sorry I didn't see your post. I must have missed the notification. I did eventually get the image printed. Only a couple of weeks ago actually. It's come up quite nice. Only thing it's letting through a lot more light than the original backglass. So have to find either softer globes or add a sheet of some sort of defusing material behind the image. I have it sitting between two sheets of 3mm perspex. I'll try and attach an image.

Try standard 180 Degree Cool white or Warm White LEDs. Maybe even color match with LEDs. Incandescent would be too bright in this instance.