In contrast, building occupants need to detect visual alarms for emergency notification in illuminated interior spaces, and often when the alarm signal is not in the field of view. Effective intensity was defined more than a century ago for navigational searchlights and signal lights, often viewed in darkness from miles away, when the signal light is barely visible. The performance of a flashing visual alarm signal is defined in terms of its effective intensity, which is the luminous intensity of a steady-burning (non-flashing) light that has the same visibility as the flashing signal. They help ensure that individuals with hearing loss or in otherwise noisy environments are aware of emergencies and other situations requiring their attention. LRC Study On Emergency Visual Alarms Publishedįlashing visual alarms are a critical element of emergency notification systems in buildings.
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