The EITS can be programmed to turn on its red light and record video at regular intervals. Alternatively it can be programmed to record when its very sensitive light detector, called a photomultiplier tube, sees a bioluminescent flash. The flash triggers the camera to record 3 seconds of video with the lights out, in order to record the luminescence, and then turns on the red light to reveal the source of the light. Animation courtesy of Jon Saint

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