Even the streetlights, circular glowing tubes, were not all that different.

All along the walls were glowing tubes; when Shannow reached up and touched one, it was faintly warm.

Inside it was warm and bright with glowing tubes.

Opening the back of the cabinet, The Shadow saw the glowing tubes.

Find out what's going on inside these glowing tubes!

Beyond the gate there was a large, covered courtyard illuminated by glowing tubes on right and left.

A glowing tube, a spire of light, will begin at ground level and run up through the facade and into the sky.

On it, a Cubs baseball cap, a glowing tube, and a scrap of paper had appeared.

In this way, several different colors can be produced inexpensively from a single glowing tube.

The airstrip, a long glowing tube reaching into the darkness, sat on the other side of the lab.