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Magnetic Suspension Lamp- with helical LED filament: not only does this lamp defy gravity, the LED in the bulb is powered through wireless induction- and controlled by the switch in the base. This kind of levitation uses a control system with an adjustable electromagnet in a feedback loop with Hall effect sensors which allows for fine tuning of the magnetic field to exactly balance the pull of gravity. As seen at the end of the video- if this lamp design is unplugged (or the power goes off) the
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Tutorial: Make a LOVE Lamp with LED Filament Letters
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51 a filament lamp of 200 ohm resistance is used at 150 v supply how much resistance should be joined in series with it to use it at 210 v supply 74666
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