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Temporal light modulations may also induce disturbance or malfunction of equipment that applies light as input signal. Examples are barcode scanners, cameras and medical test equipment. Interference of photo, film and video cameras may become visible by humans after displaying the image or replaying the recorded video or projection of a film. [ 5 ]
Temporal light artefacts (TLAs) are undesired effects in the visual perception of a human observer induced by temporal light modulations. Two well-known examples of such unwanted effects are flicker and stroboscopic effect. Flicker is a directly visible light modulation at relatively low frequencies (< 80 Hz) and small intensity modulation levels.
These are easily recognizable by their red tips on an otherwise unpainted clear white bulb, and are available in the different voltages required for 10, 20, 35/70, and 50/100/150/200-light sets. Some older mini-light sets interlaced two circuits, putting all of the odd-numbered bulbs on one and the even-numbered ones on the other, allowing some ...
New lighting systems have not used magnetic ballasts since the turn of the century, however some older installations still remain. Fluorescent lamps with magnetic ballasts flicker at a normally unnoticeable frequency of 100 or 120 Hz (twice of the utility frequency; the lamp is lit on both the positive and negative half-wave of a cycle).
Upon detonation, a stun grenade produces a blinding flash of light and an extremely loud "bang". They are often used in close-quarters combat , door breaching , and riot control , typically to stun enemies or distract them.
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