Light

Light was the part of the electromagnetic spectrum that was visible to the eye.

The Light were halogen lifeforms, who looked like they were made of bright light. (PROSE: The Twilight Streets)

Light guns were handheld weapons which paralysed their victims in a bright beam of white light. (TV: The Savages)

Light-beings were a species which resembled balls of light. (PROSE: Endgame)

Spiridons were a species that were made invisible by anti-reflecting light waves. Only eye-plants could see them. (PROSE: Doctor Who and the Planet of the Daleks)

The Weeping Angels were a species which could only move if no one was seeing them. Humans needed light to see them. (TV: Blink)

Within the Time Vortex, light, darkness, matter and energy all blended, divided, shift and changed. (PROSE: The Chase)

A Tyk was a creature that absorbed light to grow. (COMIC: The Lunar Tyk)

The Animus could physically generate a light that seemed to either hypnotise and/or weaken individuals. (TV: The Web Planet)

During their journeys in the 20th century Bea Nelson-Stanley and her husband Edgar saw people made of light. (PROSE: Eye of the Gorgon)

The Ancient Lights were energy entities which were able to disobey the physical laws of the universe using the power of astrology. They looked like yellow light. (TV: Secrets of the Stars)