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Singing light bulb on dimmer switch

Most light bulbs hum loudly when dimmed via a dimmer switch.  A few are ok,
because they contain extra filament supports at critical positions.

My hanging (swag) kitchen tiffany-style light takes a G40-150w bulb.  It
hums badly when dimmed.

(1) Is there a brand of G40-150 bulb that does not hum when dimmed?

(2) Alternatively, is there a small, in-line filter available, or a
filtered, table-top dimmer switch, that would create a smoother
short-duty-cycle output than the intermittent, alternating square-wave
created by a typical dimmer switch?   Would that be safe for a household
lamp application?  Would that eliminate the audible humming?

 - David

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