On an initiating device, the design requirement that prevents light flame detectors from alerting too easily?

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The main idea is that flame detectors are built to respond to the distinct flicker patterns produced by a real flame rather than to steady or unrelated light. By incorporating flickering action into the design, the device looks for the characteristic rapid, flame-like light fluctuations and filters out both steady illumination and other non-flame light sources. This time-based filtering helps prevent nuisance alarms from ambient lighting, reflections, or pulsed light that doesn’t resemble flame flicker, so the detector only triggers when the flame’s flicker signature is present. Other options would either reduce sensitivity in a broad, non-specific way (radiation shielding) or address ambient light in ways that don’t specifically leverage the flame’s flicker behavior, or would rely on more complex recognition without addressing the core need to differentiate flame flicker from ordinary light changes.