What is the collective noun for lights?

There isn't a single, commonly accepted collective noun for lights. However, you can use various options depending on the context:

General:

* A constellation of lights (suggests a grouping of lights in the sky)

* A cluster of lights (implies a close group of lights)

* A string of lights (used for Christmas lights, or a series of lights along a path)

* A display of lights (for a visual presentation of lights)

Specific:

* A bank of lights (for a group of stage lights)

* A set of lights (for a group of lights used together)

* A collection of lights (for a variety of lights gathered together)

Ultimately, the best collective noun will depend on the specific situation and the type of lights you're referring to.