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Bright LED lights commonly turn on and off rapidly in order to adjust their brightness as far as the human eye is concerned. Our eyes can not detect that they are turning on and off, but many light level sensors can. A capacitor between the output and ground, will slow down voltage changes.
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If the LDR voltage divider is rapidly changing voltages and the capacitor value is large enough, then a middle ground voltage will build up across the capacitor, and the capacitor voltage will barely change.
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