1) Strobe
Found on
https://www.crosswordclues.com/clue/flashtube
A flashtube, also called a flashlamp, is an electric arc lamp designed to produce extremely intense, incoherent, full-spectrum white light for very short durations. Flashtubes are made of a length of glass tubing with electrodes at either end and are filled with a gas that, when triggered, ionizes and conducts a high voltage pulse to produce the l...
Found on
http://en.wikipedia.org/wiki/Flashtube
electric discharge lamp giving a very bright, very brief burst of light, useful in photography and engineering. See flash lamp.[2 related articles]
Found on
http://www.britannica.com/eb/a-z/f/34
No exact match found.
