The LEDtronics advanced PAR-style LED lamps series use high-power, high-efficacy Cree LEDs and UV-stabilized, plastic Fresnel lenses to maximize delivery of warm-white (3,200K) light. In many cases, ...

Fresnel lenses were invented over two centuries ago to help lighthouses prevent shipwrecks. They're still enhancing safety, ...

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 ...

Aside from frightening small children, we have absolutely no idea why anyone would need a face-magnifying headpiece. But the video below gives us a chuckle every time we see it, and we figure a good ...

When Röntgen discovered X-rays in 1895, he immediately searched for a means to focus them 4,5. On the basis of uncertain observations of slight refraction in prisms, he stated that the index of ...