Detection behaviour matters as much as output. Passive infrared trips on heat movement and is prone to false triggers from HVAC vents and passing cars; microwave and dual-technology sensors are more selective. Coverage pattern, range and the ability to set sensitivity and duration decide whether the fixture is useful or just annoying. Dusk-to-dawn photocells handle the always-on case.
This group covers motion-activated floodlights, twin-head security units, dusk-to-dawn area lights, and combination fixtures with integrated sensors. Where a sensor is field-adjustable, the adjustment range is listed.
