lamp sing


Resident Curmudgeon
Senior Team
Premium Member
Aug 21, 2007
Las Vegas, NV, USA
Also called filament-hum or buzz, is a phenomenon of the clipped waveform of all phase-control dimmers. Higher wattage lamps are usually more susceptible, as are PAR56 and 64 lamps of all wattages.

The latest sine-wave dimmers, which work by altering the amplitude of the sine-wave rather than clipping it, eliminate this problem. Some concert halls, where ALL environmental noise is a distraction, are installing sine-wave dimmer today, with variable results.

It has been suggested that Sine Wave Dimmers are "the party the dimmer manufacturers gave, but nobody came" --[USER]STEVETERRY[/USER], in the USA. Due to cost, and sometimes lack of reliability and poor design in early implementations (even by a well-known manufacturer), market uptake of Sine Wave dimmers in the USA has been minimal.

See also this article from the ETC wiki: Risetime and Lamp Noise - What's the Connection? and the CB wik entry dimmer rise time.
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