There isn't a more specific term for a thin ray of light.

However, depending on the context, you might use terms like:

* Light beam: This term is generally used for a more concentrated and focused beam of light.

* Light ray: This term is used in geometric optics to represent the path of light as a straight line.

* Light streak: This term might be used to describe a thin, bright line of light that appears to be moving rapidly.

Ultimately, the most appropriate term depends on the specific situation and what you are trying to describe.