Edimax Technology IC-1520POE - Manual (Page 21)

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more) fluorescent light(s), the image may look flashing.
In this case, you can adjust this setting to the frequency
of electrical power; this can improve the image quality
effectively. If you don’t know which one you should use,
just try any of them and select one with less flicker.
Brightness This camera will adjust the brightness of captured image
automatically, however, you can adjust the brightness of
the image here, from 0 to 99 (step 5 below 95). An
improper brightness setting will lose the detail of image,
please try all brightness settings and find the best setting
of your environment. You may have to adjust the setting
again every time you move the camera to a new place.
When you place the camera at a dark place, the
brightness setting may help, but will not help too much.
Setting the brightness to a too high value will lose the
details of image. In this case, you should try to improve
the brightness of the environment where camera is
located (like keep the lights on, or add some lights), but
not the brightness setting here.
Example:
With brightness setting 95, the lamp at the middle of
image looks all white.