Abstract: An intelligent light fixture facilitates the use of a ‘universal’ light bulb having a wattage rating. A lamp dimmer circuit disposed within the fixture is in electrical communication between the AC line and a socket. A bulb test circuit within the fixture is operative to determine the maximum wattage of the bulb. A controller, also within the fixture includes a wattage select input. The controller is operative to determine the maximum wattage of the bulb using the bulb test circuit, compare the maximum wattage to the wattage select input and, if the maximum wattage is greater than the wattage select input, control the dimmer circuit to ensure that the power delivered to the bulb does not exceed the wattage select input. The bulb test circuit may determine the maximum wattage of the bulb by measuring the resistance of the bulb's filament or alternatively, by temporarily impressing line voltage across the bulb and measuring the current drawn by the bulb's filament.

Abstract: An intelligent light fixture facilitates the use of a ‘universal’ light bulb having a wattage rating. A lamp dimmer circuit disposed within the fixture is in electrical communication between the AC line and a socket. A bulb test circuit within the fixture is operative to determine the maximum wattage of the bulb. A controller, also within the fixture includes a wattage select input. The controller is operative to determine the maximum wattage of the bulb using the bulb test circuit, compare the maximum wattage to the wattage select input and, if the maximum wattage is greater than the wattage select input, control the dimmer circuit to ensure that the power delivered to the bulb does not exceed the wattage select input. The bulb test circuit may determine the maximum wattage of the bulb by measuring the resistance of the bulb's filament or alternatively, by temporarily impressing line voltage across the bulb and measuring the current drawn by the bulb's filament.