Question: what is the difference between kali and kali light?
Answer: The normal ISO provides the full Kali 2.0 setup using GNOME 3, which now requires 768MB of memory. The light ISO provides a Kali 2.0 setup using XFCE, and a smaller selection of tools (Iceweasel, OpenSSH,). Looks like Kali Linux is having fill package where as kali linux lite has only basic package.