Encyclopedia - Light: Encyclopedia - Light
Light is electromagnetic radiation with a wavelength that is visible to the eye (visible light) or, in a technical or scientific context,...   » Read the article

Encyclopedia - Lighting: Encyclopedia Ii - Lighting - Lighting Design
Lighting design as it applies to the built environment, also known as 'architectural lighting design', is both a science and an art. Prop...   » Read the article

Encyclopedia - Lighting: Encyclopedia Ii - Lighting - Vehicle Lighting
Vehicles typically include headlights and tail lights. Headlights are white or yellow lights placed in the front of the vehicle, designed...   » Read the article

Encyclopedia - Light: Encyclopedia Ii - Light - Theories About Light
Light - Early Greek ideas. In 55 BC Lucretius, continuing the ideas of earlier atomists, wrote that light and heat from the Sun were co...   » Read the article

Encyclopedia - Light: Encyclopedia Ii - Light - Theories About Light
Light - Early Greek ideas. In 55 BC Lucretius, continuing the ideas of earlier atomists, wrote that light and heat from the Sun were co...   » Read the article

Encyclopedia - Christmas Lights: Encyclopedia - Christmas Lights
Christmas lights (also sometimes called fairy lights or twinkle lights) are strands of electric lights used to decorate homes and Christm...   » Read the article

Encyclopedia - Electric Light: Encyclopedia - Electric Light
Most of the industrialized world is lit by electric lights, which are used both at night and to provide additional light during the dayti...   » Read the article

Encyclopedia - Zumtobel Lighting Group: Encyclopedia - Zumtobel Lighting Group
As a group of leading lighting brands and companies Zumtobel provides complete professional lighting solutions, luminaires, lighting mana...   » Read the article

Encyclopedia - Visible Light Astronomy: Encyclopedia - Visible Light Astronomy
Visible light astronomy encompasses a wide variety of observations via telescopes that are sensitive in the range of visible light. It in...   » Read the article

Encyclopedia - Characteristic Light: Encyclopedia - Characteristic Light
A light characteristic is a coded description displayed on a nautical chart under the chart symbol for a lighthouse, lightvessel or sea m...   » Read the article

Encyclopedia - Bicycle Lighting: Encyclopedia - Bicycle Lighting
Bicycle lighting has two main purposes: seeing and being seen. There are several types of bicycle lights available, each with its own adv...   » Read the article

Encyclopedia - Bonny Light Oil: Encyclopedia - Bonny Light Oil
Bonny Light oil is a grade of crude oil produced in the Bonny region of Nigeria. Fraudulent offers of cheap Bonny Light oil, often backed...   » Read the article

Encyclopedia - Inner Light: Encyclopedia - Inner Light
The concept of the Inner Light is central to many versions of Quaker (or Religious Society of Friends) theology. It refers to God's prese...   » Read the article

Encyclopedia - Toward The Light: Encyclopedia - Toward The Light
Toward the Light (in Danish Vandrer mod Lyset) is an ethical, philosophical and religious work, first published in Denmark in 1920. Accor...   » Read the article

Encyclopedia - Bili Light: Encyclopedia - Bili Light
A Bili Light is a phototherapy tool to treat newborn jaundice (hyperbilirubinemia) which in higher levels causes brain damage Kernicterus...   » Read the article

Encyclopedia - Light Pollution: Encyclopedia Ii - Light Pollution - Types Of Light Pollution
"Light pollution" is a broad term that refers to multiple problems, all of which are caused by inefficient, annoying or arguably unnecess...   » Read the article

Encyclopedia - Light Pollution: Encyclopedia Ii - Light Pollution - Reducing Light Pollution
Reducing light pollution implies many things, such as reducing sky glow, reducing glare, reducing light trespass, and reducing clutter. T...   » Read the article

Encyclopedia - Light Pollution: Encyclopedia Ii - Light Pollution - Light Pollution As A Problem
"Light pollution" is a term that is used to refer to light that people find annoying. Some skeptics claim that light pollution should not...   » Read the article

Encyclopedia - Light Pollution: Encyclopedia Ii - Light Pollution - Consequences Of Light Pollution
Light pollution wastes energy, can reduce security, obscures the night sky, and may hurt human and animal health. Energy is wasted when l...   » Read the article

Encyclopedia - Christmas Lights: Encyclopedia Ii - Christmas Lights - House Lights
In the U.S. from the 1960s, beginning in tract housing, it became increasingly the custom to completely outline the house (but particular...   » Read the article

Encyclopedia - Stage Lighting: Encyclopedia Ii - Stage Lighting - The Lighting Designer
See main article - Lighting designer The above elements of lighting are primarily the domain of the Lighting Designer (LD). The LD is res...   » Read the article

Encyclopedia - Lighting: Encyclopedia Ii - Lighting - Lamps
Commonly referred to as 'light bulbs', lamps are the removable/replaceable portion of a luminaire which convert electrical energy to both...   » Read the article

Encyclopedia - Electric Light: Encyclopedia Ii - Electric Light - Types
Types of electric lighting include: incandescent light bulbs arc lamps gas discharge lamps, e.g., fluorescent lights, neon lamps, modern...   » Read the article

Encyclopedia - Stage Lighting: Encyclopedia Ii - Stage Lighting - Lighting Instruments
There are a variety of instruments frequently used in the theater. Although they vary in many ways they all have the following four basic...   » Read the article

Encyclopedia - Traffic Light: Encyclopedia Ii - Traffic Light - Traffic Lights And The Law
In virtually all jurisdictions in which they are used, it is a legal offense for motorists to disregard the instructions of traffic light...   » Read the article

Encyclopedia - Street Light: Encyclopedia Ii - Street Light - Purposes Of Street Lights
There are three distinct main uses of street lights, each requiring different types of lights and placement. Incorrect misuse of the diff...   » Read the article

Encyclopedia - Street Light: Encyclopedia Ii - Street Light - History Of Street Lighting
Before incandescent lamps, gas lighting was employed. The earliest lamps required that a lamplighter tour the town at dusk, lighting each...   » Read the article

Encyclopedia - Street Light: Encyclopedia Ii - Street Light - History Of Street Lighting
Before incandescent lamps, gas lighting was employed. The earliest lamps required that a lamplighter tour the town at dusk, lighting each...   » Read the article

Encyclopedia - Lighting: Encyclopedia Ii - Lighting - Fixtures
Lighting fixtures come in a wide variety of styles for various functions. Some are very plain and fuctional, while some are pieces of art...   » Read the article

Encyclopedia - Christmas Lights: Encyclopedia Ii - Christmas Lights - Types
In modern times, Christmas lighting devices can be based on different technologies. Common technologies are incandescent light bulbs and ...   » Read the article

Encyclopedia - Bicycle Lighting: Encyclopedia Ii - Bicycle Lighting - Rear Lighting
Bicycle lighting - Filament lamps. The only real advantage to these is that they are often omnidirectional, being visible through a ver...   » Read the article

Encyclopedia - Bicycle Lighting: Encyclopedia Ii - Bicycle Lighting - Front Lighting
Bicycle lighting - LEDs. Cyclists that ride at night only occasionally might opt for an inexpensive LED front light and rear LED flashe...   » Read the article

Encyclopedia - Christmas Lights: Encyclopedia Ii - Christmas Lights - History
The first known electrically-illuminated Christmas tree was the creation of Edward H. Johnson, an associate of inventor Thomas Edison. Wh...   » Read the article

Encyclopedia - Christmas Lights: Encyclopedia Ii - Christmas Lights - Safety
In the past, Christmas light sets used line-voltage (120 or 240 volts depending on what country) lightbulbs, similar to those used in ref...   » Read the article

Encyclopedia - Christmas Lights: Encyclopedia Ii - Christmas Lights - History
The first known electrically-illuminated Christmas tree was the creation of Edward H. Johnson, an associate of inventor Thomas Edison. Wh...   » Read the article

Encyclopedia - Bicycle Lighting: Encyclopedia Ii - Bicycle Lighting - Measures Of Light Output
There are three main units used in the measuring of light output. Manufacturers are in the business of selling product, so do not always ...   » Read the article

Encyclopedia - Street Light: Encyclopedia Ii - Street Light - Disadvantages
The major criticisms of street lighting are that it can actually cause accidents if misused, and can cause light pollution. Street light...   » Read the article

Encyclopedia - Traffic Light: Encyclopedia Ii - Traffic Light - Introduction
Traffic lights for normal vehicles or pedestrians always have two main lights, a red one that means stop and a green one that means go. U...   » Read the article

Encyclopedia - Traffic Light: Encyclopedia Ii - Traffic Light - Introduction
Traffic lights for normal vehicles or pedestrians always have two main lights, a red one that means stop and a green(or white for pedestr...   » Read the article

Encyclopedia - Traffic Light: Encyclopedia Ii - Traffic Light - Technology
In the mid 1990s, cost-effective traffic light lamps using light emitting diodes (LEDs) were developed; prior to this date traffic lights...   » Read the article

Encyclopedia - Traffic Light: Encyclopedia Ii - Traffic Light - Preemption
Some regions have signals that are interruptible, giving priority to special traffic. This is usually reserved for emergency vehicles suc...   » Read the article

Encyclopedia - Black Light: Encyclopedia Ii - Black Light - Uses
The ultraviolet radiation itself is invisible to the human eye, but illuminating certain materials with UV radiation prompts the visible ...   » Read the article

Encyclopedia - Traffic Light: Encyclopedia Ii - Traffic Light - Mounting
There are significant differences from place to place in how traffic lights are mounted or positioned so that they are visible to drivers...   » Read the article

Encyclopedia - Traffic Light: Encyclopedia Ii - Traffic Light - History
On 10 December 1868, the first traffic lights were installed outside the British Houses of Parliament in London. They resembled railway s...   » Read the article

Encyclopedia - Light Years: Encyclopedia Ii - Light Years - Charts
Light Years - Album. ... See also:Light Years, Light Years - Reissue/Tour Edition, Light Years - Track listing, Light Years - Origina...   » Read the article

Encyclopedia - Half Light: Encyclopedia Ii - Half Light - Cast
Released by Universal/UIP Release Dates -January 12, 2006 (Hungary) January 17, 2006 (DVD) (USA) March 24, 2006 (UK) May 18, 2006 (German...   » Read the article

Encyclopedia - Earthquake Lights: Encyclopedia Ii - Earthquake Lights - History
Records of earthquakes that were accompanied by sky lights can be found in 373 BC in ancient Greek writings, that "immense columns of fla...   » Read the article

Encyclopedia - Earthquake Lights: Encyclopedia Ii - Earthquake Lights - Appearance
The lights are most evident in the middle of the quake, although there are reports of lights that occurred after or even before the earth...   » Read the article

Encyclopedia - Ray Of Light: Encyclopedia Ii - Ray Of Light - Instrumentation
Ray of Light includes elaborate instrumental arrangements – for example, the string arrangement on "Frozen" – and extensive use of mo...   » Read the article

Encyclopedia - Ray Of Light: Encyclopedia Ii - Ray Of Light - Drugs
Although Madonna has never been a habitual drug user (despite claims that she had been smoking endo when appearing on a notorious episode...   » Read the article

Encyclopedia - Marfa Lights: Encyclopedia Ii - Marfa Lights - The Characteristics Of Marfa Lights
Reports of evidently similar strange nocturnal lights in this area have persisted all through the twentieth century, and they continue to...   » Read the article

Encyclopedia - Light Rail: Encyclopedia Ii - Light Rail - Disadvantages Of Light Rail
Like all modes of rail transport, light rail tends to be safest when operating in dedicated right-of-way with complete grade separations....   » Read the article

Encyclopedia - Light Rail: Encyclopedia Ii - Light Rail - Disadvantages Of Light Rail
Like all modes of rail transport, light rail tends to be safest when operating in dedicated right-of-way with complete grade separations....   » Read the article

Encyclopedia - Light Rail: Encyclopedia Ii - Light Rail - Advantages Of Light Rail
Light rail systems are generally cheaper to build than heavy rail, since the infrastructure does not need to be as substantial, and tunne...   » Read the article

Encyclopedia - Light Rail: Encyclopedia Ii - Light Rail - Advantages Of Light Rail
Light rail systems are generally cheaper to build than heavy rail, since the infrastructure does not need to be as substantial, and tunne...   » Read the article

Encyclopedia - Bicycle Lighting: Encyclopedia Ii - Bicycle Lighting - History
The earliest bicycle and car lights were generally powered by acetylene (carbide) lamps, now almost unused except by cavers. They were di...   » Read the article

Encyclopedia - Guiding Light: Encyclopedia Ii - Guiding Light - 1980s
The 1980s was a time of many transitions and many firsts for the show. In 1980, the Dobsons were moved to ATWT, and replaced by Douglas M...   » Read the article

Encyclopedia - Guiding Light: Encyclopedia Ii - Guiding Light - Radio
The series was created by Irna Phillips, who based it on personal experiences. After giving birth to a still-born baby at age 19, she fou...   » Read the article

Encyclopedia - Danger Lights: Encyclopedia Ii - Danger Lights - Synopsis
Louis Wolheim plays the boss of the railroad yard in Miles City, Montana. The film opens with a landslide across the tracks in Montana, a...   » Read the article

Encyclopedia - Different Light: Encyclopedia Ii - Different Light - Singles
Peaked at #2, Billboard US Singles Chart, April, 1986 If She Knew What She Wants b/w Angels Don't Fall in Love Peaked at #29, Billboard...   » Read the article

Encyclopedia - Synchrotron Light: Encyclopedia Ii - Synchrotron Light - Operation
When a charged particle is accelerated, either along a straight path or laterally along a curved path, it radiates electromagnetic energy...   » Read the article

Encyclopedia - Lord Of Light: Encyclopedia Ii - Lord Of Light - Plot
Lord of Light is set on a planet colonized by the remnants of a destroyed "Urath", Earth. The crew and colonists from the Star of India f...   » Read the article

Encyclopedia - Lord Of Light: Encyclopedia Ii - Lord Of Light - Characters
The novel has a range of major and minor characters, each with a backstory which, in some cases, is deliberately vague with the intent of...   » Read the article

Encyclopedia - Guiding Light: Encyclopedia Ii - Guiding Light - 1960s
Agnes Nixon wanted to see social issues worked into the plot, and set the tone for much of the material used during the 1960's. One story...   » Read the article

Encyclopedia - Guiding Light: Encyclopedia Ii - Guiding Light - 1970s
Feeling pressure from newer, more youth-oriented soaps such as The Young and the Restless, Procter & Gamble hired headwriters Bridget...   » Read the article

Encyclopedia - Guiding Light: Encyclopedia Ii - Guiding Light - 1990s
By the early 1990s, the Bauers, Spauldings, Lewises, and the Coopers had been established as core families in the fictional midwestern ci...   » Read the article

Encyclopedia - Guiding Light: Encyclopedia Ii - Guiding Light - 2000s
At the turn of the century, a large segment of the show revolved around San Cristobel, as Cassie married Richard and Richard's evil broth...   » Read the article

Encyclopedia - Marfa Lights: Encyclopedia Ii - Marfa Lights - The Skeptics
Skeptics discount paranormal sources for the lights, attributing them to mistaken sightings of ordinary nighttime lights, such as distant...   » Read the article

Encyclopedia - Holy Light: Encyclopedia Ii - Holy Light - Worship Of The Light
Lordaeron was the home of the Church of the Light, influencing both Lordaeron and Quel'Thalas with its teachings. The Church birthed the ...   » Read the article

Encyclopedia - Lord Of Light: Encyclopedia Ii - Lord Of Light - Structure
The novel is structured as a series of long chapters, each a distinct story of part of a campaign by the hero Sam against the Gods. The f...   » Read the article

Encyclopedia - City Lights: Encyclopedia Ii - City Lights - Plot
The plot concerns Chaplin's Tramp, broke and homeless, falling in love with a poor blind girl (Virginia Cherrill) who mistakes him as a m...   » Read the article

Encyclopedia - Guiding Light: Encyclopedia Ii - Guiding Light - History
The series was created by Irna Phillips, who based it on personal experiences. After giving birth to a still-born baby at age 19, she fou...   » Read the article

Encyclopedia - Half Light: Encyclopedia Ii - Half Light - Plot
(Spoiler Warning) Rachel (Moore) is a sucessful American murder mystery author living in London with her son (Thomas) and her second husb...   » Read the article

Encyclopedia - Stage Lighting: Encyclopedia Ii - Stage Lighting - Qualities Of Lighting
In the pursuit of these principles, the three main qualities or properties of interest are: Intensity: Measured in both lux and lumens. ...   » Read the article

Encyclopedia - Guiding Light: Encyclopedia Ii - Guiding Light - Cast
Guiding Light - Current cast members. Scott Bailey (Sandy Foster) (2003-present) Neal Bledsoe (Quinn Matthews) (2005-present) Rob Bogu...   » Read the article

Encyclopedia - Children Of The Light: Encyclopedia Ii - Children Of The Light - History
Children of the Light - Founding and development. The Children of the Light were founded by Lothair Mantelar in FY 1021, amidst the War...   » Read the article

Encyclopedia - Traffic Light: Encyclopedia Ii - Traffic Light - Unusual Traffic-light Usages
In parts of Canada (the Maritime Provinces, Quebec, Ontario and Alberta), a flashing green light has a special meaning. It is identical i...   » Read the article

Encyclopedia - Traffic Light: Encyclopedia Ii - Traffic Light - Traffic Lights In Other Contexts
The symbolism of a traffic light (and the meanings of the three primary colors used in traffic lights) are frequently found in many other...   » Read the article

Encyclopedia - Speed Of Light: Encyclopedia Ii - Speed Of Light - History
Until relatively recent times, the speed of light was largely a matter of conjecture. Empedocles maintained that light was something in m...   » Read the article

Encyclopedia - Gas Lighting: Encyclopedia Ii - Gas Lighting - History
Early lighting fuels consisted of olive oil, beeswax, fish oil, whale oil, sesame oil, nut oil, and similar substances. These were the mo...   » Read the article

Encyclopedia - Gobo Lighting: Encyclopedia Ii - Gobo Lighting - Production
A gobo may be made from thin metal sheet, usually stainless steel, or from etched glass, depending upon the complexity of the design. Gla...   » Read the article

Encyclopedia - Speed Of Light: Encyclopedia Ii - Speed Of Light - Physics
Speed of light - Constant velocity from all reference frames. It is important to realise that the speed of light is not a "speed limit"...   » Read the article

Encyclopedia - Light Gun: Encyclopedia Ii - Light Gun - How Light Guns Work
The "light gun" is so named because it uses light as its method of detecting where on screen you are targeting. The name leads one to bel...   » Read the article

Encyclopedia - Speed Of Light: Encyclopedia Ii - Speed Of Light - Overview
According to standard modern physical theory, all electromagnetic radiation, including visible light, propagates (or moves) at a constant...   » Read the article

Encyclopedia - Speed Of Light: Encyclopedia Ii - Speed Of Light - Communications
The speed of light is of relevance to communications. For example, given that the equatorial circumference of the Earth is 40,075 km...   » Read the article

Encyclopedia - Gobo Lighting: Encyclopedia Ii - Gobo Lighting - Use
The gobo is placed in the focal plane of the lantern (generally an ellipsoidal reflector spotlight). The desired pattern is then projecte...   » Read the article

Encyclopedia - Light Years: Encyclopedia Ii - Light Years - Singles
Five singles were released from the album: "Spinning Around" was the first single and was released in June 2000. It debuted at number one...   » Read the article

Encyclopedia - Bicycle Lighting: Encyclopedia Ii - Bicycle Lighting - Supplementary Lighting And Conspicuity
Bicycle lighting - Headtorches. Headtorches, such as those made by Petzl are a useful adjunct to bicycle lights. They can be pointed wi...   » Read the article

Encyclopedia - Light In August: Encyclopedia Ii - Light In August - Synopsis
The narrative structure consists of three connected plot-strands. The first strand tells the story of Lena Grove, a young pregnant woman ...   » Read the article

Encyclopedia - Stage Lighting: Encyclopedia Ii - Stage Lighting - Control Tools
Lighting control might best be described as anything that changes the quality of the light. This has primarily been done by intensity con...   » Read the article

Encyclopedia - Light Infantry: Encyclopedia Ii - Light Infantry - Light Infantry Today
Today, the term light infantry is used to refer to infantry who are not transported in armoured fighting vehicles, instead walking or usi...   » Read the article

Encyclopedia - Light Infantry: Encyclopedia Ii - Light Infantry - Light Infantry Today
Today, the term light infantry is used to refer to infantry who are not transported in armoured fighting vehicles, instead walking or usi...   » Read the article

Encyclopedia - With The Lights Out: Encyclopedia Ii - With The Lights Out - Significance
Rumours of a posthumous Nirvana box set, or anthology, first surfaced in the mid-1990s, not long after the suicide of the band's singer a...   » Read the article

Encyclopedia - Bicycle Lighting: Encyclopedia Ii - Bicycle Lighting - Choosing An Appropriate Lighting System
If you want to cycle at low speeds, in familiar areas, with street lights, other ambient lighting, or when there's a full moon on a cloud...   » Read the article

Encyclopedia - Light: Encyclopedia Ii - Light - Measurement Of Light
The following quantities and units are used to measure the quantity or "brightness" of light. edit edit Sometimes confusingly called "in...   » Read the article

Encyclopedia - Light: Encyclopedia Ii - Light - Light Sources
There are many sources of light. The most common light sources are thermal: a body at a given temperature emits a characteristic spectrum...   » Read the article

Encyclopedia - Light: Encyclopedia Ii - Light - Speed Of Light
Although some people speak of the "velocity of light", the word velocity should be reserved for vector quantities, that is, those with bo...   » Read the article

Encyclopedia - Light: Encyclopedia Ii - Light - Refraction
All light propagates at a finite speed. Even moving observers always measure the same value of c, the speed of light in vacuum, as c = 29...   » Read the article

Encyclopedia - Light: Encyclopedia Ii - Light - Visible Electromagnetic Radiation
Visible light is the portion of the electromagnetic spectrum between the frequencies of 380 THz (3.8×1014 hertz) and 750 ...   » Read the article

Encyclopedia - Light: Encyclopedia Ii - Light - Color And Wavelengths
The different wavelengths are detected by the human eye and then interpreted by the brain as colors, ranging from red at the longest wave...   » Read the article