No Low Light Scene Detection - The scanner attempts to detect motion as best it can with the aiming pattern and illumination turned off when the scanner is idle.
Aiming Pattern Low Light Assist Scene Detection - Illumination is off, but the aiming pattern is on when the scanner is idle to assist in scene detection.
Dim Illumination Low Light Assist Scene Detection - The aiming pattern is off, but illumination is on at a dim level to assist in scene detection.