On Tue, 24 Jan 2006, David VanHorn wrote:

> I could be wrong, but I thought these were current driven devices, as in
> more current = less light, in a linear sense.

More current = more light. The drive coil will spin the rotor magnet 
against a (weak) spring. It works exactly like an analog meter except it 
is moving magnet not moving coil, and it has a feedback winding.

Peter
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