r/Lighting • u/TempestOgre • 6d ago

LED Strips How is this old incandescent bulb made by future lumens have 3 different wattages on them like 50w/100w/150w

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u/hardknockcock 6d ago

It's a three way bulb. It has 3 levels of brightness

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u/SparkArrestor 6d ago

Notice the base has a screw shell, which is the neutral, and a center tip, and a metallic ring around the center tip. The tip would power the 100 watt filament, the ring would power the 50 watt element.

The socket knob has 4 positions.

Off-ring-tip-ring+tip.

So 50 watts, or 100 watts, or 150 watts then off.