Abstract: A LED light fixture and a luminous flux monitoring system for a light fixture. The light fixture includes a housing defining an interior space including an interior surface and a transmissive panel. A light source is coupled to the interior surface. The system includes a light sensor coupled to the interior surface and aligned to receive light from the transmissive panel, light source, and/or interior surface. The light sensor is configured to measure luminous flux in the interior space. A controller is coupled to the light source and the light sensor. The controller is configured to determine if a light sensor measurement of luminous flux in the interior space is more or less than a reference value of the luminous flux. If the measurement of luminous flux is less than the reference value, the controller is configured to activate an end-of-life indicator. The reference value equals (total flux?internal ambient flux)×depreciation factor.

Abstract: A LED light fixture and a luminous flux monitoring system for a light fixture. The light fixture includes a housing defining an interior space including an interior surface and a transmissive panel. A light source is coupled to the interior surface. The system includes a light sensor coupled to the interior surface and aligned to receive light from the transmissive panel, light source, and/or interior surface. The light sensor is configured to measure luminous flux in the interior space. A controller is coupled to the light source and the light sensor. The controller is configured to determine if a light sensor measurement of luminous flux in the interior space is more or less than a reference value of the luminous flux. If the measurement of luminous flux is less than the reference value, the controller is configured to activate an end-of-life indicator. The reference value equals (total flux?internal ambient flux)×depreciation factor.

Abstract: An in-ground lighting apparatus has an enclosure for placement below the surface of the earth and a lamp is mounted for adjustable positioning in the housing. In the improvement, the lamp base and lamp are supported by two pivot-mounted brackets. The brackets are spaced from the lamp rim and provide lamp-grasping clearance between them for easy re-lamping. And the brackets permit the lamp to be adjusted to direct light anywhere within a cone-shaped 360.degree. envelope. The lamp is supported solely by its base. In a particular embodiment configured for use with HID lamps, the lamp and ballast assembly are constructed as an "integrated" unit which is easily lifted from the enclosure for service.