Professional Lighting Terms - Illumination
E=Φ/S
Φ- luminous flux (Lm)
S-Irradiated area (m2)
An alarm is a device for issuing an alarm signal.A signal used to issue a warning, a warning, and an alarm.Air defense warning refers to the alarm system set up during the war to prevent enemy air attacks.It is an important part of urban air defense works, which is a warning of air defense when the city is threatened by air strikes.
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