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i dont know maybe your lightbulb is messed up. There could be many possibilities depending on the situation. If a high wattage unit comes on (like an air conditioner), there could be a drain on the system that causes a light to dim. Sometimes during a storm, there could be a problem at the power substation including a power surge or break in the system, that could cause lights dimming. If too many strands of lights in a series are connected, you run the risk of overloading that circuit, which could cause dimmed and blown lights, and potentially dangerous situations.

Consult a Master Electrician for more information.

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15y ago
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12y ago

Lights dim when there is a voltage sag or brownout. A voltage sag can happen when a large appliance such as a large motor or heater comes on. The large current draw causes the supply voltage to drop slightly causing light bulbs to dim since they're operating @ a lower than rated voltage.

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12y ago

It may have been doing nothing on it for too long.

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Q: What causes lights to dim?
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