The Foscam IR-Cut models have an extra function to block infrared light during the day time. This is to prevent the distortion of the color which is seen without IR-Cut in cameras. This allows the colors to not be influenced by infrared light during the day and at night it is still possible to use night vision with infrared light. The cameras active the infrared LEDs for night vision themselves and also operate the IR-Cut filter so it is in the correct position. Therefore, the user has nothing to worry about.
These photos are taken in a green environment on a sunny day. The color distortion is greatest in this situation and shows the clear difference between the two.