Koninklijkle Philips N.v.

Sel B Colak

Lorenzo Feri

Johan P M G Linnartz

Johannes Petrus Wernars

Tim C W Schenk

Paulus H A Damink

Hendricus T G M Penning De Vries

A method for driving a lamp () comprises the steps of: generating a lamp current (I) having a constant magnitude; defining a commutation period having a duration T; defining a time base of original commutation moments, having fixed mutual intervals of 0.5*T; receiving data to be embedded in the light output; commutating the lamp current at commutation moments; wherein individual commutations are time-modulated in order to encode said received data. Preferably, a commutation moment is: either equal to an original commutation moment if there are no data to embed; or advanced over a modulation distance (&#x394;) with respect to the corresponding original commutation moment in order to encode data having a first value ('0'); or delayed over said modulation distance (&#x394;) with respect to the corresponding original commutation moment in order to encode data having a second value ('1').

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Eindhoven, Germany

Sel B Colak