What kind of signal is typically produced by visual notification appliances in an emergency situation?

Visual notification appliances are designed to alert individuals in emergency situations, particularly in environments where audible alarms may not be sufficient. The typical signal produced by these devices is a flashing strobe light. This type of signal is effective because the rapid bursts of light are attention-grabbing, providing a clear visual cue that can override other visual distractions in the environment.

Flashing strobe lights are commonly used in various settings, including places where individuals may be hearing impaired or in noisy environments, ensuring that notifications reach everyone. The flashing nature of the signal can help to convey urgency and prompt immediate action, such as evacuation or seeking safety.

Other forms of light, such as constant lights or white lights, may not be as effective for alerting individuals during an emergency. A constant light may not capture attention in the same way as a strobe, and white light does not typically convey the urgency associated with emergencies. Infrared signals are not used for visual notification but rather for other types of communication or detection, making them unsuitable for the purpose of alerting individuals visually in emergency situations.