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Normally, light from the light source shoots straight across and misses the sensor. When smoke enters the chamber, it scatters the light, which then hits the sensor and triggers the alarm. Photoelectric smoke detectors typically respond faster to a fire in its early, smoldering stage, before the source of the fire bursts into flames.
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Hard light in a photograph of Nina Sublatti performing at the Eurovision Song Contest. Hard light comes from a single, usually bright, source, which is relatively small compared to the subject. [2] [3] Photographs taken in such lighting have high contrast and sharply defined shadows. [1] The appearance of the shadow depends on the lighting ...
An electric light, lamp, or light bulb is an electrical component that produces light. It is the most common form of artificial lighting . Lamps usually have a base made of ceramic , metal, glass, or plastic which secures the lamp in the socket of a light fixture , which is often called a "lamp" as well.
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