Possible Causes of Dimming Recessed Cans



Voltage Fluctuations

Voltage fluctuations on the circuit can cause lights to dim. Ensure that the voltage being supplied to the cans is stable and within the specified range for the ballasts.

Induction from High-Voltage Equipment

High-voltage equipment, such as motors or transformers, can generate magnetic fields that can induce voltage spikes on nearby circuits. These voltage spikes can cause lights to dim.

EMI/RFI Interference

Electromagnetic interference (EMI) and radio frequency interference (RFI) from other electrical devices can also cause recessed lights to dim. Check for any nearby sources of EMI/RFI and try to isolate them.

Loose Connections

Loose connections in the circuit can cause voltage drops and flickering lights. Check the connections at the ballasts, fixtures, and electrical panel.

Ballast Failure

While non-dimmable ballasts have been replaced, there may still be an issue with the remaining ballasts. Inspect the ballasts for any signs of damage or overheating.

Circuit Overload

If the circuit supplying the recessed cans is overloaded, it can cause voltage drops and dimming. Verify the current draw of all devices connected to the circuit and ensure that it does not exceed the circuit's capacity.

Capacitor Failure

Capacitors in the ballasts can fail over time, leading to flickering or dimming lights. Inspect the capacitors for any signs of bulging or leakage.

60Hz Cycle Issue

While this is unlikely, it is possible that a 60Hz cycle issue is causing the dimming. Monitor the dimming pattern and see if it corresponds to a specific time period or frequency.

Troubleshooting Steps:1. Check voltage fluctuations using a voltmeter.
2. Inspect for nearby high-voltage equipment or sources of EMI/RFI.3. Tighten all electrical connections.
4. Replace any suspect ballasts.5. Verify circuit load and ensure it does not exceed capacity.
6. Check capacitors in the ballasts.7. Monitor dimming pattern for any specific timing or frequency. Flag for review