Patent ID: 8669721

Claim:
A lighting device comprising: a switching element operable to enable current to flow from a direct current power circuit through a solid state light source when switched on, and to block current from flowing from the direct current power circuit through the solid state light source when switched off; and a current controller operable to provide a predetermined target current through the solid state light source by providing on-pulses to the switching element to selectively turn the switching element on, wherein the switching element is off when the switching element is not receiving an on-pulse from the current controller, said current controller comprising a first switching controller operable to determine a width of an on-pulse of a series of on-pulses, and a second switching controller operable to determine a burst-on time of a series of burst-on times, wherein during each burst-on time the series of on-pulses determined by the first switching controller is provided to the switching element.