Incandescent beacon flash rate shall be between __ and __ flashes per minute.

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Multiple Choice

Incandescent beacon flash rate shall be between __ and __ flashes per minute.

Flashes per minute affect how clearly a beacon is noticed and interpreted as a warning. If the rate is too slow, people may miss it; if it’s too fast, the light can look like a continuous glow or become distracting. A range of 20 to 40 flashes per minute provides enough visibility to catch attention without seeming like a rapid strobe, and it fits typical historical incandescent beacon systems and safety expectations. Rates below 20 risk being overlooked, while rates above 40 can be perceived as too rapid or irritating.

Flashes per minute affect how clearly a beacon is noticed and interpreted as a warning. If the rate is too slow, people may miss it; if it’s too fast, the light can look like a continuous glow or become distracting. A range of 20 to 40 flashes per minute provides enough visibility to catch attention without seeming like a rapid strobe, and it fits typical historical incandescent beacon systems and safety expectations. Rates below 20 risk being overlooked, while rates above 40 can be perceived as too rapid or irritating.

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