I have a bedside lamp with a 100W halogen lamp which runs directly off
110V. In the base of the lamp is a small rotary switch about 3/4" in diameter. It has three positions: Full intensity, reduced intensity and off. No other parts are discernible.The question is: How does the lamp achieve the reduction in light intensity (about half)?
I actually know the answer because I took the switch apart but when I was looking for it before on Google etc. I could not find it.
I am posting here to see how widely this trick is known.
Oh, and the lamp is *metal*.
Michael Koblic, Campbell River, BC