I understand the energy conservation while on battery but I have seen the same with rigs connected to the wall.
In: 4
The scene only needs to be illuminated for the time it takes for the film (or more likely today, the digital image sensor) to be exposed, aka the “shutter speed”. In modern cameras and smartphones 1/125th or 1/250th of a second is a typical setting but many can go as fast as 1/8000th of a second or faster.
There’s just no reason to have a bright light for any longer than that, because that’s how long it takes to take the photo. In addition to the energy use concerns you’ve already mentioned, it would be blinding for anyone having their picture taken. One major benefit of the rapid flash is that the picture gets taken before anyone reacts to the flash and closes their eyes (which usually takes around 1/10 of a second).
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