This would be typical in a 3-way floor-standing floor lamp. In the case of the 50/100/150 W bulb, putting this bulb in a regular lamp socket will result in it behaving like a normal 100 W bulb.Ī key switch 3-way socket has the switch incorporated in the lamp socket and requires no external wiring between switch and socket. Thus, if a 3-way bulb is screwed into a standard light socket that has only a center contact, only the medium-power filament operates. The center contact of the bulb typically connects to the medium-power filament, and the ring connects to the low-power filament. A problem of these devices is that the ring contact of the socket (contact two in photo) digs into the lead seal on the lamp bulb's contact ring and this connection tends to fail early (sometimes in months), leading to intermittent flashes, popping noises, and loss of power to the low wattage filament as the lead seal on the bulb's ring alternately melts and solidifies. This extra contact matches a ring-shaped contact on the bottom of a 3-way bulb, which creates the connection for the second filament inside the bulb. This contact is positioned off-center in the bottom of the socket (contact two in photo). In addition to the two contacts of the standard socket, a third contact is added.
The metal threads of the bulb base touch the socket shell, which creates the neutral connection, and this is how the electrical circuit is completed.Ī 3-way socket has three electrical contacts. When a standard bulb is screwed into a standard socket, a matching contact on the bottom of the bulb presses against the metal tongue in the center of the socket, creating the live connection. The threaded metal shell is itself the neutral contact (contact three in photo). In the center of the bottom of a standard socket is the hot contact (contact one in photo), which typically looks like a small metal tongue bent over. 3-way bulbs Ī standard screw lamp socket has only two electrical contacts. In recent years, LED 3-way bulbs have become available as well. Ĭertain compact fluorescent lamp bulbs are designed to replace 3-way incandescent bulbs, and have an extra contact and circuitry to bring about similar light level. Lamp bulbs with dual carbon filaments were built as early as 1902 to allow adjustable lighting levels. So unlike incandescent bulbs controlled by a dimmer, the color of the light does not change between the three steps of light available.
3 WAY BEDROOM LAMPS FULL
In 3-way incandescent light bulbs, each of the filaments operates at full voltage. A 3-way lamp requires a 3-way bulb and socket, and a 3-way switch. JSTOR ( May 2020) ( Learn how and when to remove this template message)Ī 3-way lamp, also known as a tri-light, is a lamp that uses a 3-way light bulb to produce three levels of light in a low-medium-high configuration.Unsourced material may be challenged and removed. Please help improve this article by adding citations to reliable sources. This article needs additional citations for verification.
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