Hi,
It is the ID of that attachment, that is how that single image works, takes the ID of the image and change it in to the size, according to the size given in the backend.
or try something simple like this.
<figure class="lightbox"><a href="http://localhost/swift/supreme/wp-content/uploads/2013/10/img0-1024x640.jpg" class="view"><img width="1920" height="1200" alt="img0" class="attachment-full" src="http://localhost/swift/supreme/wp-content/uploads/2013/10/img0.jpg"></a></figure>
Change the path and height and width, etc.
Let us know,
Thanks,
laranz.