Uploaded November 2024 | Updated September 2026, 1 week ago

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What's inside a headlamp made by Sigg, replacing the red LEDs with phosphor yellow ones (which are like very warm white LEDs, unlike standard yellow LEDs).

The FNIRSI multimeter:
fnirsi.com/products/dmt-99?sca_ref=9216013.ntkg5GeG0R&utm_source=af&utm_medium=ref&utm_campaign=9216013

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