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A 3-way light bulb cleverly manages with only two filamentsWhy does a 3-way light bulb have only two filaments? Michele, Someplace, WorldA 3-way light bulb has two filaments: one low-power and one high-power. It combines the two to shed light at three levels.
The bulb uses just the low- A clear 3-way bulb. Photo courtesy of James D. Hooker, University of Wales.Three-way bulbs are always made in white finish so its nearly impossible to see the 2 filaments inside, but here's one James Hooker of Lighting Equipment News specially made up a few years ago. You can clearly see the three wires feeding two vertical filaments, one larger than the other, at the center of the bulb. (Answered June 20, 2001; updated June 2, 2008) | ||||||||||||||||||||||||||||||||||||||||||||||||||||||
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power filament for DIM, just the high-power filament for MEDIUM, and both filaments for
BRIGHT.