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----- within 30m, short-distance monitoring object (zooming times of the
camera module is about X1~X3), the unit will turn on IR lamps for low
brightness, so that the brightness is appropriate, the object is neither too dark
nor too bright for monitoring.
----- 30m~60m, medium-distance monitoring object (zooming times of the
camera module is about X4~X8), the unit will turn on IR lamps for medium
brightness to meet the requirement of the brightness for medium distance
object monitoring.
----- 70m~120m, long-distance monitoring object (zooming times of the
camera module is above X9), the unit will turn on IR lamps for high brightness
to meet the requirement of the brightness for long-distance object monitoring.
7.9.2 Auto-control of the brightness of the IR lamps (Outdoor mode)
a. input 166
b. Press PREVIEW key
This auto-control mode is suitable for very open outdoor monitoring
environment where there is influence by other light. It is different from the
auto-control described above (the indoor mode), the difference is that, in this
mode, the unit will start to turn on the IR lamps for medium brightness even
when the object distance is short within 30m.
7.9.3 Manual-control mode for the brightness of the IR lamps
If both of the two auto-control modes above still can not meet the requirement
for actual monitoring environment and good image effect still can not be got,
the unit also has brighness manual-control function. Users can manually
