Occasionally, you may sometimes notice that a lamp is buzzing. This is caused by the lamp filament vibrating as the dimmer rapidly switches the lamp on and off. Lamp buzz is generally noisiest at the mid-range (50%) dimming level. If this happens, use rough service lamps (sometimes called garage door opener lamps), physically smaller lamps, or lower wattage lamps.
The most effective way of reducing lamp buzz is to install a lamp debuzzing coil (LDC) in the lighting circuit. When an LDCÂ is wired in series with the dimmer, it slows down the inrush of current during the rapid switching cycle of the dimmer. As the current inrush is slowed down, the lamp filament vibration and lamp buzz is reduced.
Lutron has two LDC models available to help reduce lamp buzz. The type of LDC required depends on the total wattage of the dimmer’s lighting load. Listed below are the model numbers and their respective capacity:
LDC-10-TCPÂ Â Â Â Â Â 600 - 1200W
LDC-16-TCPÂ Â Â Â Â Â 1201 - 1920W
Note: For loads under 600W, consult the toll-free Lutron hotline 24/7 (800).523.9466
LDCs may be wired in series with the dimmer on its line side or load side. Each dimmer requires its own LDC. LDCs themselves make an audible buzz, and therefore, should be mounted in an area where the noise will not be objectionable (e.g. an electrical closet, a basement, or above a drop ceiling). The LDCs are UL listed and thermally protected.