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Exposure is the total amount of light allowed to fall on a sensor or film during the taking of a photograph. This is determined by the exposure time (shutter speed) and amount of light admitted (lens aperture). Today, sensor/film sensitivity (ISO speed) is often also considered to be part of exposure.
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Why are these light trails large blobs of light instead of nice thin lines?
The blobs result from the bright areas being extremely overexposed. So, quite simply, you need less light coming in. The ways to do that are:
shorter shutter speed (keeping ISO & aperture the same.. …