For projects requiring more flexibility in lighting, LED scoreboards, or horticulture designs, TRC provides constant power LED drivers. These drivers maintain consistent power within their optimal load range, allowing for higher current usage compared to traditional drivers, enhancing efficiency and reducing the need for multiple models. They include features like PFC, UL8750, dimming options, and IP-rated metal enclosures. Our experts will guide you through your project and keep you updated on industry trends.

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The fastest f-number for the human eye is about 2.1,[10] corresponding to a diffraction-limited point spread function with approximately 1 μm diameter. However, at this f-number, spherical aberration limits visual acuity, while a 3 mm pupil diameter (f/5.7) approximates the resolution achieved by the human eye.[11] The maximum density of cones in the human fovea is approximately 170,000 per square millimeter,[12] which implies that the cone spacing in the human eye is about 2.5 μm, approximately the diameter of the point spread function at f/5.

In optics, the Airy disk (or Airy disc) and Airy pattern are descriptions of the best focused spot of light that a perfect lens with a circular aperture can make, limited by the diffraction of light.

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The most important application of this concept is in cameras and telescopes. Owing to diffraction, the smallest point to which a lens or mirror can focus a beam of light is the size of the Airy disk. Even if one were able to make a perfect lens, there is still a limit to the resolution of an image created by this lens. An optical system in which the resolution is no longer limited by imperfections in the lenses but only by diffraction is said to be diffraction limited.

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Mathematically, the diffraction pattern is characterized by the wavelength of light illuminating the circular aperture, and the aperture's size. The appearance of the diffraction pattern is additionally characterized by the sensitivity of the eye or other detector used to observe the pattern.

...the star is then seen (in favorable circumstances of tranquil atmosphere, uniform temperature, &c.) as a perfectly round, well-defined planetary disc, surrounded by two, three, or more alternately dark and bright rings, which, if examined attentively, are seen to be slightly colored at their borders. They succeed each other nearly at equal intervals round the central disc....

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Diffuse light arises when direct light is scattered naturally like by clouds or with artificial means. Diffused light is not harsh and that has been softened ...

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However, Airy wrote the first full theoretical treatment explaining the phenomenon (his 1835 "On the Diffraction of an Object-glass with Circular Aperture").

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The diffraction pattern resulting from a uniformly-illuminated circular aperture has a bright region in the center, known as the Airy disk which together with the series of concentric bright rings around is called the Airy pattern. Both are named after George Biddell Airy. The disk and rings phenomenon had been known prior to Airy -- John Herschel described the appearance of a bright star seen through a telescope under high magnification for an 1828 article on light for the Encyclopedia Metropolitana:

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It's called a map light I'm pretty sure. Just a dim light if you need some light but don't want to turn on an actual light.