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Suturing needs 1,000 lux and CRI>=90; a 120/320 lm CRI 92 headlamp with 3 cells (32.08 Wh usable, 16.9 h mixed) meets all tasks for $26.50, $34.50 as a kit with spares. Human problem: Midwives and clinicians cannot read charts, find veins, or suture safely at night without task light that meets lux and colour-rendering bounds for a full shift.
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William Alexander Aldred (2026) studied this question.
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