Light rays are streams of light that travel through gaps in between objects. (See post #2619062)
Spotlight is the a beam of light that shines down over somebody. This usually happens during a stage performance as a focal point for spectators or when a character is down at least on one's knee for some reason. (See post #3819066)
For tagging purposes, keep in mind that a particular image may satisfy one or more of the specific terms mentioned above.