The component of the electric field perpendicular to the line of crystals, however, can cause only small movements in the electrons as they cannot move very much from side to side. This means there will be little change in the perpendicular component of the field leading to transmission of the part of the light wave polarized perpendicular to the crystals only, hence allowing the material to be used as a light polarizer.[citation needed]

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The original material, patented in 1929[1] and further developed in 1932 by Edwin H. Land, consists of many microscopic crystals of iodoquinine sulphate (herapathite) embedded in a transparent nitrocellulose polymer film. The needle-like crystals are aligned during the manufacture of the film by stretching or by applying electric or magnetic fields. With the crystals aligned, the sheet is dichroic: it tends to absorb light which is polarized parallel to the direction of crystal alignment but to transmit light which is polarized perpendicular to it.

This material, known as J-sheet, was later replaced by the improved H-sheet Polaroid, invented in 1938 by Land. H-sheet is a polyvinyl alcohol (PVA) polymer impregnated with iodine. During manufacture, the PVA polymer chains are stretched such that they form an array of aligned, linear molecules in the material. The iodine dopant attaches to the PVA molecules and makes them conducting along the length of the chains. Light polarized parallel to the chains is absorbed, and light polarized perpendicular to the chains is transmitted.[2]

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Polarizing sheets are used in liquid-crystal displays, optical microscopes and sunglasses. Since Polaroid sheet is dichroic, it will absorb impinging light of one plane of polarization, so sunglasses will reduce the partially polarized light reflected from level surfaces such as windows and sheets of water, for example. They are also used to examine for chain orientation in transparent plastic products made from polystyrene or polycarbonate.

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Polaroid is a type of synthetic plastic sheet which is used as a polarizer or polarizing filter. A trademark of the Polaroid Corporation, the term has since entered common use.

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The resultant electric field of an electromagnetic wave (such as light) determines its polarization. If the wave interacts with a line of crystals as in a sheet of polaroid, any varying electric field in the direction parallel to the line of the crystals will cause a current to flow along this line. The electrons moving in this current will collide with other particles and re-emit the light backwards and forwards. This will cancel the incident wave causing little or no transmission through the sheet.

Luminaire designed for flush installation on walls and floors in outdoors and indoors areas. Suitable for power LED sources. Its body is made of Anticorodal alluminium alloy, submitted to anodizing treatment up to 18 micron. Temperated glass is integral to the body through a special glue-sealant used in shipbuilding. The PMMA precision optics allow the propagation of light for long distance. The snap-in installation of the devices is allowed through the mounting of stainless steel casing. The anti-vandal stainless steel springs that make the device particularly suitable for installation in public and private areas. The device is removable via dedicated disassembly key to be ordered separately. The protection degree IP67 is ensured by a special waterproof cable gland system and silicone gasket. The integrated LED driver allows its 48VDC power supply. It is equipped with 2 cables with fast connectors to be connected to the power supply line, through appropriate waterproof connection systems not included to be ordered separately.

Another type of Polaroid is the K-sheet polarizer, which consists of aligned polyvinylene chains in a PVA polymer created by dehydrating PVA. This polarizer material is particularly resistant to humidity and heat.[3]

The luminous effects, even continuous, offered by this series’ wide range are endless. Retaining springs shelter the model from any tampering attempt, steel keys and suction pad are the only way of dismantling it. A wall takes shape with an impressive light flow, in the same way the floor reshapes its own geometries. LINE PRO for indoor and outdoor is the right solution to flood the space with bright light.