The levitating wirelessly-powered light-bulb is actually an improvement of an earlier version, which had somewhat diminished performance. In the new sculpture the bulb levitates roughly 2.5 inches from the nearest object. Magnetic field sensing (Hall Effect) and an electromagnet with a properly designed feedback-controller stabilize the bulb in mid air. Using a pair of coupled resonant coil windings, Lieberman created a wireless power transmission system [driven at resonance], which sends power through the air gap from electronics hidden in the top of the framing into the light bulb, which uses efficient light emitting diodes (LEDs).
Recently, we reported that researchers from MIT were able to light a 60watt light bulb wirelessly from a distance of about 2 meters. In a few-year’s time, their new wireless power transmission method may enable the charging of our cellular phones, MP3 players and laptops using wireless technology without ever worrying about running out of power.