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  About The project was born in 2000 from “Eureka!” moment caused when a team of researchers were attempting to dim a LASER source and couldn’t! This caused them to search for the reason behind the intriguing anomaly that apparently defies physics and found it in biology! The pool discovered that the mammalian eye has a photon capturing “sample and hold” feature. This along with help from international centres of excellence like the University of Cambridge (GB), Bangalore University (India), Singapore Institute of Technology (Singapore), Massachusetts Institute of Technology (USA), some astonishing results were attained and paved the way for Night Sun®, which is supplied with firmware that, in a way analogous to MPEG audiovisual data compression protocols, can eliminate the production of photons not perceived by the human eye and emit only those perceived by it! This system, therefore, is able to provide the same perceived light as an identical device without the firmware (and certain secret manufacturing operations specific to the S2LEs [Solid State Light Emitter] at the heart of Night Sun®), but on less than half the power. The firmware also has remote power management features that allow further savings by programming lower output in hours when less light may be required to maintain minimal legal lighting conditions. The S2LEs Night Sun® employs are made the same way some LASERs are, that means they are powerful but safe, because they are NOT LASERs, they are safer even than mercury vapour and fluorescent lamps which emit some ultraviolet light which is damaging to the retina, and safer than arc and incandescent luminaires which emit some infrared light which is a fire and scalding hazard, Night Sun® produces white light based on a safe monochromatic safe visible light source. Indeed thermal pollution from artificial illumination causes air conditioning costs to skyrocket also causing secondary economic and ecological damage. In an outdoor setting the power management feature also allows the gradual and calibrated reduced power consumption at dawn and dusk as well as between the first and third quarter of the lunar cycle and can even provide stronger illumination in tourist areas in season and less off season, for example, allowing for even greater environmental and economic advantages and those are only some of the reasons why Night Sun® is ecologically and economically friendly. Another important feature of Night Sun® is its decades-long life, (certified to 80,000 hours constant use to 70% initial output, and our technology, by causing the components to run at a lower temperature, and other such amenities, may extend that to 160,000) because it uses solid state components that are not subject thermal shock and are insensitive to mechanical shock, being in an IP67 certified controlled environment that is its designer case, also unlike conventional lighting devices, the breakdown causes a complete lack of light whereas Night Sun® has a slow controlled decay certified in industry approved accelerated aging tests as 30% over 20 years. The firmware takes care of that as well by overdriving the standard rated current by less than 0.5% of the minimum rating or 300 micro amps, per month, so as to provide constant light intensity throughout the decades. Indeed the special enhanced operational safety low voltage regulated power supply (will not electrocute anyone coming into contact with it by accident) also cleans spiky supplies which often cause bulbs to blow before their expected lifetime, and being stepped down, the light output will not be affected by brown-outs, indeed with the optional buffer backup battery they can withstand prolonged blackouts also, very important for public safety and crime prevention in cities with high crime rates. This brings us onto another interesting application: solar powered lighting, made feasible by the low power consumption, so that now instead of paying for itself in 25 years in a conventional lighting situation, the solar panel can pay for itself in a much shorter, more bearable, 2-3 years. Very good to get the buyer’s business off the power grid for its lighting needs. Some Physics Lambert’s Cosine Law Solid state lighting components like LEDs, S2LEs and LASERs are typically made up of a semiconductor substrate with an “n doped” layer (one overflowing in electrons leaving some free) and a “p doped” layer (poor in electron content or rich in “holes” able to capture free electrons and which emit light when in contact with them, like positrons do) and sandwiched between the two layers is a layer of neutral substrate which on passing of a sufficient current, is the scene of the combination of the excess holes and electrons from the two doped layers with subsequent light emission, which follows Lambert’s law. In photometrics, Lambert's cosine law says that the total radiant power observed from a "Lambertian" surface is directly proportional to the cosine of the angle between the observer's line of sight and the surface normal. It is named after Johann Heinrich Lambert, from his Photometria, published in 1760. An important consequence of this law is that when an area element on the surface is viewed from any angle, it has the same radiance. This means, for example, that to the human eye it has the same apparent brightness (or luminance). has patented and created a system capable of high performance high quality low cost lighting applications for illuminating roads and parks, shopping malls, swimming pools, stadia, car parks, gardens, factories, communities, discos and even cemetery lighting. The agile driving of the light sources used allows for remote control and management. Photometrics There are 4 units to be familiar with: 1) Luminous Flux: unit of measurement: lumen (lm), this unit refers to the amount of phos (Φ) or visible energy radiation (conventionally 380-780nm), filtered at around 555nm to maximise emulation of retinal cone (photopic) response at the expense of the retinal rod (scotopic) response, emitted by a source over unit time (phos/sec). CIE regulations require measurement of luminous flux after 100 hours of operation. 2) Illuminance: unit of measurement: lux (lx): this is the ratio of luminous flux received by a surface and its area, the amount of light striking a unit of area. 1 lux is defined as 1 lumen of visibile photons striking a surface of 1 square metre. 3) Luminous Intensity: unit of measurement: candela (cd): this indicates the amount of luminous flux emitted by a source within a solid angle in the direction given. An ideal point source emits radiation equally in all directions, propagating spherically. Real light sources do not emit light uniformly. Technically luminous distribution is represented as a vector from the centre of an imaginary sphere of which two orthogonal vertical sections are called the “photometric curve”, shown right. ==> 4) Luminance: unit of measurement: candela per square metre (cd/m2): this is the ratio of intensity of luminous radiation emitted by a surface in a given direction and the apparent area of that surface. It represents the sense of primary (direct) or secondary (reflected) brightness. It is important to note the difference between illuminance (related to the amount of light emitted from a primary or secondary source) and luminance (related to the brightness reflected from a secondary source). An illuminance of 500 lux on identical light and dark surfaces give very different luminance values. |
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