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Showing papers on "Light pillar published in 2008"


Journal ArticleDOI
TL;DR: The light pollution model is employed to analyze spatial behavior of luminance at the night sky under cloudless and overcast conditions and discusses the discrepancies between sky luminance distributions when at first the planar light sources are considered and at second the point-source approximation is accepted.
Abstract: The light pollution model is employed to analyze spatial behavior of luminance at the night sky under cloudless and overcast conditions. Enhanced light excess is particularly identified at cloudy skies, because the clouds efficiently contribute to the downward luminous flux. It is evident that size of ground-based light sources can play an important role in the case of overcast sky conditions. Nevertheless, the realistically sized light sources are rarely embedded into light pollution modeling, and rather they are replaced by simple point sources. We discuss the discrepancies between sky luminance distributions when at first the planar light sources are considered and at second the point-source approximation is accepted. The found differences are noticeable if the size of the light source, distance to the observer, and altitude of a cloudy layer are comparable one to the other. Compared with point-source approximation, an inclusion of the size factor into modeling the light sources leads to partial elimination of the steep changes of sky luminance (typical for point sources of light). The narrow and sharp light pillars normally presented on the sky illuminated by point light sources can disappear or fuse together when two or more nearby light sources are considered with their real sizes. Sky elements situated close to the horizon will glow efficiently if luminous flux originates from two-dimensional ground-based entities (such as cities or villages).

25 citations


Book
03 Jan 2008
TL;DR: The Path of Light, Reflection of Light and Refraction of Light were investigated by Daguerreotypes in this article, where the authors described the relationship between the path of light and the reflection of light.
Abstract: The Path of Light.- The Reflection of Light.- Daguerreotypes: Light Captured.- The Refraction of Light.- Lenses: From Water Drops to Telescopes.- Sources of Light and Color.- Diffraction and Interference.- Rainbows.- Sea, Sky, and Cloud.- Polarized Light and Sunglasses.- Photons, Electrons, and the Atom.- X-rays, Ultraviolet Light, and Infrared.- X-ray Emission: Earth, Moon, and Mars.

11 citations


Patent
11 Jun 2008
TL;DR: In this paper, the authors proposed a utility model for a high power LED integrated light source, which consists of a circuit board, a LED crystal source base seat, and a light reflecting layer.
Abstract: The utility model relates to a high power LED integrated light source, which belongs to the LED light source technology field. The utility model mainly solves the problems that the LED crystal source base seat of the prior LED light source adopts a plane shape, the direct projecting property of the LED ensures that the illuminated area of the LED light source is small, the light pillar is very blinding, therefore, the LED can not enter the practical lighting phase. The utility model is mainly characterized in that the utility model comprises a LED circuit board, a LED crystal source base seat and a LED crystal source which is connected on the two electric poles of the power source of the LED circuit board and positioned on the LED crystal source base seat, the utility model is characterized in that a sealed lampshade is arranged at the side of the LED crystal source, the vacuum is pumped or the nitrogen gas is filled or the inert gas is filled in the lampshade; a layer of light reflecting layer is coated on the dummy club surface of the LED crystal source base seat; the LED crystal source is installed on the light reflecting layer. The utility model has the characteristics that the utility model can be suitable for the various lighting environment, the light decay is reduced, and the service life is prolonged, and the utility model is mainly used for the high power LED integrated light source.

3 citations


Patent
15 Oct 2008
TL;DR: In this article, the utility model relates to a rubber anti-collision pillar used for traffic safety, which is characterized in that a pillar body made of rubber, a base and a pin roll which are made of natural rubber and a rotary joint are included.
Abstract: The utility model relates to a rubber anti-collision pillar used for traffic safety, which is characterized in that a pillar body made of rubber, a base and a pin roll which are made of rubber and a rotary joint are included The pillar body is connected with the base through the pin roll and the rotary joint, and an elastic rubber band is arranged between the pin roll and the rotary joint A crystal lattice reflective membrane of yellow and white paint is arranged on the outside surface of the rubber pillar The rubber anti-collision pillar is made of natural rubber and synthetic rubber and provided with a unique rubber elastic round pillar body and a rubber base The pillar body is connected with the base through an elastic rubber material, can conduct a tilt of 90 degrees within a range of 360 degrees, can bear shocks and extrusions, has strong weather resistance, can restore to the original shape after a collision without any damage, can protect vehicles from being damaged after a collision, has convenient shifting and fixing The rubber anti-collision pillar is durable, has light pillar body, and is safe and reliable

1 citations