What is the maximum intensity in candelas that visual notification devices shall not exceed?

Visual notification devices, such as strobe lights in fire alarm systems, are designed to provide effective warning signals to occupants in a building. The maximum intensity of these devices is established to ensure both safety and effectiveness without causing discomfort or injury to individuals.

The correct answer, 1,000 candelas, reflects the maximum intensity that visual notification devices can reach according to industry standards. This limit is set to ensure that the signals are sufficiently bright to capture attention and alert individuals during an emergency while preventing adverse effects such as visual impairments or excessive distraction that might be caused by overly intense light.

Standards such as those outlined in the National Fire Alarm and Signaling Code (NFPA 72) guide these specifications. Keeping the intensity at 1,000 candela strikes a balance between visibility and safety, making it the appropriate threshold for ensuring effective communication in emergencies while minimizing risks to occupants.