Can you put a dimmer switch on compact fluorescent light bulbs?
I have but if dimmer is on low the light fixture sometimes
"hums", can be anoying It also shortens the bulb life,
significantly in some cases. But their are also CFL bulbs built to
be used with a dimmer switch that avoid these problems.
You should only use CFLs specifically-designed to be used with
dimmers in circuits controlled by dimmer switches. There is a
proven danger of fire hazard when ordinary CFLs are controlled by
dimmer switches and, so, this should NEVER be done.