"I used this to dim 50watt halogens down lights, it worked well with only a slight hum, you need to put your ear up to it to hear. You need to derate the dimmer by 25% when selecting the total load of the light circuit or else it will hum loudly. Mine also was loose from the back plate when opened, but a simple matter of pulling of the knob and tightening the back nut."
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Review 4 for LAP 1-Gang 2-Way Push Dimmer Switch 400W/400VA Brushed Stainless Steel
"looks lovely but poorly made considering the price. I took the first one back as the back plate was loose. the replacement is the same. And it makes an annoying humming noise when lights are dimmed. Have had no problems with the rest of the LAP range"