How does a three-way light bulb work?

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THREE WAY LIGHT BULBS

GE Three Way Halogen Light Bulb, 50 7 150 Watts

50-100-150 watt 3-way 700-1600-2300 lumens 2500 hour life 1.5 year life Boxed, Weight: 1.5 lbs., Manufacturer: GE Electric

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$6.99

3-WAY LIGHT BULB 30/100 WATT A21/WHITE 10,000 HOUR SUPRA LIFE LONG LIFE THR...

Supra Life 10,000 hour incandescent light bulbs are engineered to last up to 10 times longer than standard light bulbs, therefore reducing operational...

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$2.49

150-watt three-way A21 incandescent bulb by Osram Sylvania

150-watt three-way A21 incandescent soft white bulb with three-contact medium aluminum base. Three levels of wattage (50/100/150). Average rated life ...

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$2.95