You are preparing your small unmanned aircraft system (sUAS) for a night operation under Part 107 and need to inspect it in low ambient light. To best preserve your night vision during this preflight activity, which type of illumination should you use?

A remote pilot is studying a chart of the human dark adaptation curve, which illustrates the recovery of visual sensitivity after exposure to bright light during preparation for a night UAS operation. According to the chart, approximately how long is required for full rod (scotopic) adaptation to achieve maximum night vision capability?

A remote pilot serving as visual observer for a Part 107 night small UAS operation has just exited a brightly lit operations center. To apply best practices for mitigating physiological risks to night vision, how long should the pilot allow for dark adaptation before scanning for the aircraft?