This bulb contains LEDs to generate light. As we know LEDs are having a long life, good power efficiency, and better durability. The light bulb has a coil to receive power from the Base unit and a permanent magnet to levitate the bulb. It also contains some voltage regulator IC’s to control the input current of LEDs.
So, as of now, we understand wireless power transmission, reception, and control. Now the secret behind the levitating mechanism of the light bulb is magnets. Both, the Base and Light bulb contains the magnet. The Light bulb contains a permanent magnet whereas the Base contains electromagnets. The electromagnets generate two types of magnetic force. The fringe magnetic force of the electromagnets serves to attract the bulb while the inward magnetic force makes a repelling force. This is what holds the levitating bulb set up and makes it glide approximately 3 to 4 centimetre over the Base unit.
Magnetic levitating mechanism