The light bulb then creates the low setting brightness output. When you turn the switch the first time on a 3 way bulb, the switch connects to a tab on the outer ring contact, which is the lower wattage part of the bulb. What happens when I turn the switch?Īll electrical switches work by connecting the circuit to the load and then disconnecting it again. When turning the switch a third time, both elements will work together to provide the brightest wattage of 100 or 150 depending on the bulb you bought. The second turn will switch on just the 70W or the 100W element. Once the bulb is screwed into the base, one turn of the switch will illuminate just the low-brightness filament (usually a 30 or 50W filament). These kinds of bulbs have exactly the same kind of screw-in base just like standard bulbs. You’ll notice that the third number in both instances is the total of the other two numbers added together. ![]() These kinds of bulbs usually have listed power ratings like 30W/70W/100W or 50W/100W/150W. While standard (1-way, single filament) bulbs work by simply using a single on or off setting and one light filament, 3-way bulbs offer 3 brightness settings and 3 power wattage/brightness options. This means you’ll need to use lamps designed to work with 3-way bulbs in order to be able to select all 3 light brightness levels. Three-way bulbs need a matching socket in order to use the 3 light levels, however. They offer three instead of only one level of light to choose from. Three-way light bulbs are an extension of standard single-filament light bulbs. Three-way bulbs have a 2nd electrical contact to power the 2nd filament for more lighting options in the same bulb size. Shown here is a diagram comparing a standard 1-way (single filament) bulb to a 3-way light bulb. What if my 3 way bulb is not working correctly?. ![]() Can you put a regular (1-way) light bulb in a three way lamp?.
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