Sony DCR-HC20 - Manual (Page 49)

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Customizing Your Camcorder 49
N.S.LIGHT
When using the NightShot plus function to record, you can record clearer pictures
by using the NightShot Light to emit infrared rays (invisible).
G ON Select to use the NightShot Light (p. 29).
OFF Select to disable the NightShot Light (p. 29).