To disable the illumination on your mouse:
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Open the Logitech Gaming Software:
Start > All Programs > Logitech > Logitech Gaming Software 8.x
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Click the Light Settings icon.
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In the Lighting Settings window, under Logo Lighting, move the Brightness slide bar all the way to the left to turn off illumination. Move the bar to the right to turn it back on and to adjust the brightness.
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