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Discussion Starter #1
I just installed 3 Lutron Toggler dimmer switches. The 1st one is not humming, but the 2nd 2 are. Can someone tell me why the actual switches (not the bulbs) are humming? They are all single pole 600w switches.
 

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A "Handy Husband"
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or CFL bulbs
 

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I was just going to ask this same question. I just installed a Lutron dimmer in a 3-way circuit and heard a humming sound, louder when dim but goes away when turned all the way up. The dimmer is made for CFL bulbs but can also work with incandescents. I'm switching over to CFLs as the incandescents burn out, so right now I have a mix of incandescents(8) and CFLS(4). jcasey, is this similar to your situation?
 

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A "Handy Husband"
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Are you using CFL's that are rated for dimming?
 

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Discussion Starter #7
Sorry I disappeared guys! On the 1 that's not humming there are 4 recessed 60 watt incandescent bulbs (Sylvannia and Philips). On the one that hums a little I had 3 - 57 watt GE Edison Halogens on 1 fixture. I replaced them with GE Reveal 60 watt A19 bulbs and the hum diminished a little. The one that is the worst is has 2 - 65 watt Teiber incandescent bulbs in 2 fixtures. These have been in the fixtures since the house was built so they came out of a contractor pack. I'm using no CFLs. And Scotty just like yours the lower the light is the louder the hum.

I spoke w/ a cs rep at Lutron and they claim that a cheap bulb or one with a long filament will cause the filament to vibrate creating the hum in a choke in the switch. My concern is the one with a medium hum got warm after it was left on for a little while. Any idea why it gets warm?
 

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My recommendation would be to replace them with better bulbs. Usually Philips work well. As far as the dimmer getting warm that is typical because it is a triad base dimmer. Your are essentially turning the light on and of 60 times a second. The triac uses the metal yoke as a heat sink. If one is significantly hotter than the others then you may have a problem.
 
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