An LED illuminator activates with the onset of darkness (daylight control) and remains on during the course of the night ("always on").
Researchers at the University of California, Davis have developed a dual LED and incandescent security lighting system that uses a hybrid approach to LED illumination. It combines an ambient LED illuminator with a standard incandescent lamp on a motion control sensor. The LED illuminator activates with the onset of darkness (daylight control) and remains on during the course of the night ("always on"). The amber LED illumination is sufficient to provide low to moderate level lighting coverage to the wall and ground area adjacent to and under the fixture. The incandescent lamp is integrated with a motion control circuit and sensor. When movement in the field of view is detected (after darkness), the incandescent lamp is switched on, providing an increased level of illumination to the area. Instead of an "always on" LED illuminator, the LEDs may also be switched off when the incandescent lamp is switched on.
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