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At-Home Light-Emitting Diode Devices Safe, Effective for Acne Treatment
THURSDAY, March 6, 2025 (HealthDay News) — At-home light-emitting diode (LED) devices are effective for treating acne, ...
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Beam Me Up: Simple Free-Space Optical Communication
The heart of this setup is a basic pulse-width modulator driving the LED. Pair it with a photo diode for reception, and voilà—light beams become data carriers. Add a lens for focus, and you ...