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Occupancy sensor types include: PIR sensors, which work on heat difference detection, measuring infrared radiation.Inside the device is a pyroelectric sensor which can detect the sudden presence of objects (such as humans) who radiate a temperature different from the temperature of the background, such as the room temperature of a wall.
A passive infrared sensor (PIR sensor) is an electronic sensor that measures infrared (IR) light radiating from objects in its field of view. They are most often used in PIR-based motion detectors . PIR sensors are commonly used in security alarms and automatic lighting applications.
Low-pressure sodium lamps give only monochromatic yellow light, inhibiting color vision at night. Single ended self-starting lamps are insulated with a mica disc and contained in a borosilicate glass gas discharge tube (arc tube) with a metal cap. [3] [4] They include the sodium-vapor lamp that is the gas-discharge lamp used in street lighting ...
The Model S's battery pack is its heaviest component [55] [56] and is located inside of the car's floor. [57] [58] The battery pack consists of thousands of identical cylindrical 18650 battery cells, each measuring 18 millimetres (0.71 in) in diameter and 65 millimetres (2.6 in) in height.