Thyristor: A type of circuitry used in automatic flash units which returns unused energy to the capacitor after each shot. This design reduces recycling and power consumption substantially.
Thyristor flash gun - automatic flash gun which cuts off the flash when the exposure is correct. This conserves power, makes recycling quicker, and battery life longer.
Time and temperature - controlling factors of a chemical photographic process.
In amateur photography electronic flashguns became common in the 1960s, when electronic switches, the small light transistors and thyristors, made these devices small and affordable.
Automatic thyristor flashguns have special circuits that store unused flash ready for the next shot so recycling speeds up. This is essential for fashion and sports photography, but less so for still life.
One that works with the camera's TTL flash system and exposure compensation is very convenient; one with basic "thyristor" automation can serve the same purpose less conveniently for very little money (for fill-flash, ...
"Most studio flashes, except few top power models that reduce operating voltage, have thyristor controlled reduced flash duration, and would be as much voulnerable as the hot shoe flashes, as far as the color temperature is concerned." ...
instantly in response to the presence or absence of power being delivered to the tube, so the primary form of control you have over the light output is duration of the electrical pulse, which is switched off by a component called a "thyristor.
 See also: Exposure, Shutter, Camera, Film, Light
  
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