LED light therapy is a popular noninvasive skin treatment for acne, sun damage, wounds, and other skin problems. People can choose to have LED light therapy at a dermatologist’s office or to use a ...
If you had an array of high power addressable LEDs, how would you project them onto a wall? Perhaps you’d use a Fresnel lens, or maybe an individual lens on the top of each. [Joo] faced this problem ...
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