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where no, yo, αo and are the index of refraction, height, and slope angle of a ray in object space and ni, yi, αi are the index of refraction, height, and slope angle of the ray in image space.

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GALILEO EB Tunnel is a series of three LED floodlights for tunnel and underpass lighting. Reduce energy costs and optimize maintenance with immediate results in terms of road safety and visual comfort.

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RT-MP-2F-65: 2.000 x telecentric lens with built-in coaxial illumination ... Advanced optical specifications. Working distance (1), (mm), 65.0. Working ƒ/N ...

Each tunnel has different conditions. With over 60 years of experience, we provide consultancy and design on how to optimize the lighting system of tunnels and galleries by offering a targeted and specific solution for each project.

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Coma is easily seen by holding a lens in sunlight and then tilting it, creating an image that tails off to one side (figure 3).

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This ratio can be assured if the rays entering a lens originate at infinity (they are parallel).  This can be done using a combination of lenses (figure 4).

Coma result from the use of principle planes when considering the propagation of image through a system.  The principle planes are only really planes in the paraxial region.  As you move further from the paraxial region, the surface the rays strike is curved, affecting the focal length for these rays impacting where they focus on the object plane.  The focusing of a ray is therefore dependent on the height off the axis at which it strikes the lens.

All AEC floodlights are subjected to numerous quality tests to ensure their resistance over time in particularly hostile environments such as underpasses and tunnels.

GALILEO EB Tunnel is a series of three LED floodlights for tunnel and underpass lighting. Reduce energy costs and optimize maintenance with immediate results in terms of road safety and visual comfort.

Tunnels are particular areas where it is necessary to guarantee a high-performance, efficient and high-quality lighting system.

Physically, this means the ratio of the angle at which the ray enters the lens to the angle at which the ray leaves the lens should be constant across the lens to avoid coma.

There are two types of coma: positive and negative.  Negative coma occurs when rays hitting the lens further from the paraxial region focus closer to the axis than rays closer to the paraxial region. Positive coma is just the opposite, with the further rays focusing farther from the axis (figure 1).

You can also choose GALILEO EB Tunnel for the lighting of underpasses. In these areas, given the fast passage of drivers from an external to an internal light condition, it is very important to ensure maximum visual comfort in order to avoid disturbances or glare.

A stop can also be placed in the system.  The position of the stop affects the light rays getting through.  A positive or negative coma can be created by selective positioning.  This coma created by the stop can be used to cancel out coma present in the system independent of the stop.

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Since coma results from a change in magnification with height, for there to be no coma, the magnification must be constant everywhere:

Knight Optical can provide custom aspherical lenses and aspherical optics, from moulded plastic to diamond-turned infrared aspheric lenses.