Why do some lamps and other fixtures require two turns to turn on and off?

Question

Why do some lamps and other fixtures require two turns to turn on and off?

In: 1260

Answer 1

Because the lamp was designed with multi setting lights in mind. If you have a light that can be dim, then you’d use the first turn to turn it on, and only a second if you want full brightness. But for lights that don’t support it, the first setting isn’t enough power to turn it on.