Siemens TFT - Manual (Page 107)

The best way to view at night is with
professional infrared illumination
Infrared illuminators are ideal for situations where local restrictions prohibit the use
of visible lighting or where visible lighting attracts undesirable activity. The profes-
sional choice to allow cameras to see at night is via infrared illumination. The range
covers various distances to be illuminated, depending upon the target distance to
be monitored. Ideal for use with monochrome and day-night cameras as all
Siemens day-night models are compatible with infrared illumination.
Infrared Illumination