Lighting

qas: question: What is used a main source of light for a building during the day?
answers: text: Daylighting

question: What kind of effects can natural illumination have on a persons psychological?
answers: text: positive

question: Using natural illumination instead of artificial light sources help with what?
answers: text: energy consumption

question: Lamps and light fixtures are a form of what?
answers: text: artificial light sources

question: The use of light to achieve an aesthetic effect is know as?
answers: text: Lighting or illumination

question: What can be used a main source of light for a building during the day?
answers: text: Daylighting

question: Lamps and light fixtures  are a form of what?
answers: text: Lighting

question: What kind of effects can proper lighting have on a persons psychologically?
answers: text: positive

question: What does using natural illumination instead of artificial lighting help with?
answers: text: energy consumption

question: What is the used to achieve a practical effect?
answers: text: Lighting or illumination
context: Lighting or illumination is the deliberate use of light to achieve a practical or aesthetic effect. Lighting includes the use of both artificial light sources like lamps and light fixtures, as well as natural illumination by capturing daylight. Daylighting (using windows, skylights, or light shelves) is sometimes used as the main source of light during daytime in buildings. This can save energy in place of using artificial lighting, which represents a major component of energy consumption in buildings. Proper lighting can enhance task performance, improve the appearance of an area, or have positive psychological effects on occupants.

qas: question: What type of fixtures do you use for indoor lighting?
answers: text: light fixtures

question: What is considered a key part of interior design?
answers: text: Indoor lighting

question: What can be a intrinsic component of landscaping?
answers: text: lighting

question: What type of fixtures are used typically used for indoor lighting?
answers: text: light fixtures

question: What can be used as a intrinsic component of landscape projects?
answers: text: lighting
context: Indoor lighting is usually accomplished using light fixtures, and is a key part of interior design. Lighting can also be an intrinsic component of landscape projects.

qas: question: When was fluorescent lighting first available?
answers: text: 1939
context: Forms of lighting include alcove lighting, which like most other uplighting is indirect. This is often done with fluorescent lighting (first available at the 1939 World's Fair) or rope light, occasionally with neon lighting, and recently with LED strip lighting. It is a form of backlighting.

qas: question: What type of lighting can be mounted in the ceiling to appear flush?
answers: text: Recessed lighting
context: Recessed lighting (often called "pot lights" in Canada, "can lights" or 'high hats" in the US) is popular, with fixtures mounted into the ceiling structure so as to appear flush with it. These downlights can use narrow beam spotlights, or wider-angle floodlights, both of which are bulbs having their own reflectors. There are also downlights with internal reflectors designed to accept common 'A' lamps (light bulbs) which are generally less costly than reflector lamps. Downlights can be incandescent, fluorescent, HID (high intensity discharge) or LED.

qas: question: Peking man kindled fire as early as?
answers: text: 400,000 BCE

question: Which type of oily animals where also used as lamps after being threaded with wick?
answers: text: birds and fish

question: What is considered the earliest form of artificial lighting?
answers: text: campfires or torches

question: The hollow worked stones lamps found in Lascaux caves date back how far?
answers: text: 15,000 years
context: With the discovery of fire, the earliest form of artificial lighting used to illuminate an area were campfires or torches. As early as 400,000 BCE, fire was kindled in the caves of Peking Man. Prehistoric people used primitive oil lamps to illuminate surroundings. These lamps were made from naturally occurring materials such as rocks, shells, horns and stones, were filled with grease, and had a fiber wick. Lamps typically used animal or vegetable fats as fuel. Hundreds of these lamps (hollow worked stones) have been found in the Lascaux caves in modern-day France, dating to about 15,000 years ago. Oily animals (birds and fish) were also used as lamps after being threaded with a wick. Fireflies have been used as lighting sources. Candles and glass and pottery lamps were also invented. Chandeliers were an early form of "light fixture".

qas: question: What type of lighting was powered by electricity?
answers: text: incandescent light

question: When did gas powered street lights became economically available.
answers: text: early 1800s
context: Major reductions in the cost of lighting occurred with the discovery of whale oil and kerosene. Gas lighting was economical enough to power street lights in major cities starting in the early 1800s, and was also used in some commercial buildings and in the homes of wealthy people. The gas mantle boosted the luminosity of utility lighting and of kerosene lanterns. The next major drop in price came about with the incandescent light bulb powered by electricity.

qas: question: Street lights help reduce?
answers: text: urban crime.
context: Over time, electric lighting became ubiquitous in developed countries. Segmented sleep patterns disappeared, improved nighttime lighting made more activities possible at night, and more street lights reduced urban crime.

qas: question: What can come in a wide variety of styles for various functions?
answers: text: Lighting fixtures

question: Functioning as holder a light fixture can provide directed light and avoid?
answers: text: visual glare
context: Lighting fixtures come in a wide variety of styles for various functions. The most important functions are as a holder for the light source, to provide directed light and to avoid visual glare. Some are very plain and functional, while some are pieces of art in themselves. Nearly any material can be used, so long as it can tolerate the excess heat and is in keeping with safety codes.

qas: question: Luminous efficacy is measure in what unit?
answers: text: lumen per watt
context: An important property of light fixtures is the luminous efficacy or wall-plug efficiency, meaning the amount of usable light emanating from the fixture per used energy, usually measured in lumen per watt. A fixture using replaceable light sources can also have its efficiency quoted as the percentage of light passed from the "bulb" to the surroundings. The more transparent the lighting fixture is, the higher efficacy. Shading the light will normally decrease efficacy but increase the directionality and the visual comfort probability.

qas: question: How many Kelvins is daylight measured at?
answers: text: 6400

question: What has a color temperature around 2800 to 3000 Kelvin?
answers: text: incandescent bulb

question: It can be said that lights with a high color temperature have more energy in what color spectrum?
answers: text: blue-white

question: A lamp with more energy in the yellow and red spectrum are known to be?
answers: text: Lower color temperature
context: Color temperature for white light sources also affects their use for certain applications. The color temperature of a white light source is the temperature in Kelvin of a theoretical black body emitter that most closely matches the spectral characteristics of the lamp. An incandescent bulb has a color temperature around 2800 to 3000 Kelvin; daylight is around 6400 Kelvin. Lower color temperature lamps have relatively more energy in the yellow and red part of the visible spectrum, while high color temperatures correspond to lamps with more of a blue-white appearance. For critical inspection or color matching tasks, or for retail displays of food and clothing, the color temperature of the lamps will be selected for the best overall lighting effect.

qas: question: A light is classified by intended purpose, what mainly changes its classification?
answers: text: light produced by the fixture.
context: Lighting is classified by intended use as general, accent, or task lighting, depending largely on the distribution of the light produced by the fixture.

qas: question: Who invented track lighting?
answers: text: Lightolier

question: What feeds all the fixtures in low voltage tracks instead of each light having a line-to-low voltage transformer.
answers: text: master transformer

question: What  type of lighting uses lights that are hung or clipped to bare metal cables?
answers: text: cable lighting

question: How many volts does a track lighting system usually use?
answers: text: 12 or 24 volts
context: Track lighting, invented by Lightolier, was popular at one period of time because it was much easier to install than recessed lighting, and individual fixtures are decorative and can be easily aimed at a wall. It has regained some popularity recently in low-voltage tracks, which often look nothing like their predecessors because they do not have the safety issues that line-voltage systems have, and are therefore less bulky and more ornamental in themselves. A master transformer feeds all of the fixtures on the track or rod with 12 or 24 volts, instead of each light fixture having its own line-to-low voltage transformer. There are traditional spots and floods, as well as other small hanging fixtures. A modified version of this is cable lighting, where lights are hung from or clipped to bare metal cables under tension.

qas: question: What is a uplight used for ambient lighting?
answers: text: torchiere
context: A sconce is a wall-mounted fixture, particularly one that shines up and sometimes down as well. A torchiere is an uplight intended for ambient lighting. It is typically a floor lamp but may be wall-mounted like a sconce.

qas: question: What is one type of fixture commonly found in offices?
answers: text: table lamp

question: Magnifier lamps are considered what type of lighting? 
answers: text: task lighting
context: The portable or table lamp is probably the most common fixture, found in many homes and offices. The standard lamp and shade that sits on a table is general lighting, while the desk lamp is considered task lighting. Magnifier lamps are also task lighting.

qas: question: When would neon lighting be considered general lighting?
answers: text: dark nightclub

question: What uses diffuser panels below fluorescent lights?
answers: text: illuminated ceiling

question: Normally neon lighting is considered what type of lighting?
answers: text: accent lighting
context: The illuminated ceiling was once popular in the 1960s and 1970s but fell out of favor after the 1980s. This uses diffuser panels hung like a suspended ceiling below fluorescent lights, and is considered general lighting. Other forms include neon, which is not usually intended to illuminate anything else, but to actually be an artwork in itself. This would probably fall under accent lighting, though in a dark nightclub it could be considered general lighting.

qas: question: What do steps in move theater aisles have for safety markings?
answers: text: small lights

question: What are the low wattage lamps being replaced with in movie theaters?
answers: text: LED based versions

question: What kind of tube are the movie theaters lights enclosed in?
answers: text: translucent tube
context: In a movie theater, steps in the aisles are usually marked with a row of small lights for convenience and safety, when the film has started and the other lights are off. Traditionally made up of small low wattage, low voltage lamps in a track or translucent tube, these are rapidly being replaced with LED based versions.

qas: question: What is used to light walkways at night?
answers: text: Street Lights

question: What kind of lights are being designed for energy efficiency?
answers: text: photovoltaic luminaires
context: Street Lights are used to light roadways and walkways at night. Some manufacturers are designing LED and photovoltaic luminaires to provide an energy-efficient alternative to traditional street light fixtures.

qas: question: What kind of light is used to illuminate outdoor playing fields at night?
answers: text: Floodlights
context: Floodlights can be used to illuminate outdoor playing fields or work zones during nighttime hours. The most common type of floodlights are metal halide and high pressure sodium lights.

qas: question: Extremely bright lights used to deter crime are called?
answers: text: security lighting
context: Sometimes security lighting can be used along roadways in urban areas, or behind homes or commercial facilities. These are extremely bright lights used to deter crime. Security lights may include floodlights.

qas: question: What type of light would be used illuminate the entrance to a property?
answers: text: Entry lights
context: Entry lights can be used outside to illuminate and signal the entrance to a property. These lights are installed for safety, security, and for decoration.

qas: question: What color are tail lights?
answers: text: red

question: What color are headlamps on a vehicle?
answers: text: white or selective yellow

question: When did automakers start using electroluminescent technology to backlight gauges?
answers: text: late 1950s

question: What color are reversing indicator lamps?
answers: text: White

question: What indicates that a driver is intending to change position?
answers: text: turn signals
context: Vehicles typically include headlamps and tail lights. Headlamps are white or selective yellow lights placed in the front of the vehicle, designed to illuminate the upcoming road and to make the vehicle more visible. Many manufactures are turning to LED headlights as an energy-efficient alternative to traditional headlamps. Tail and brake lights are red and emit light to the rear so as to reveal the vehicle's direction of travel to following drivers. White rear-facing reversing lamps indicate that the vehicle's transmission has been placed in the reverse gear, warning anyone behind the vehicle that it is moving backwards, or about to do so. Flashing turn signals on the front, side, and rear of the vehicle indicate an intended change of position or direction. In the late 1950s, some automakers began to use electroluminescent technology to backlight their cars' speedometers and other gauges or to draw attention to logos or other decorative elements.

qas: question: What is the removable and replaceable part of a light fixture?
answers: text: light bulbs

question: What does a light bulb convert into electromagnetic radiation?
answers: text: electrical energy

question: Huge much light does a 13 W compact fluorescent lamp produce equivalent to a incandescent light bulb.
answers: text: 60 w

question: How many lemuns does a 15 watt fluorescent lamp produce?
answers: text: 800 lumens
context: Commonly called 'light bulbs', lamps are the removable and replaceable part of a light fixture, which converts electrical energy into electromagnetic radiation. While lamps have traditionally been rated and marketed primarily in terms of their power consumption, expressed in watts, proliferation of lighting technology beyond the incandescent light bulb has eliminated the correspondence of wattage to the amount of light produced. For example, a 60 W incandescent light bulb produces about the same amount of light as a 13 W compact fluorescent lamp. Each of these technologies has a different efficacy in converting electrical energy to visible light. Visible light output is typically measured in lumens. This unit only quantifies the visible radiation, and excludes invisible infrared and ultraviolet light. A wax candle produces on the close order of 13 lumens, a 60 watt incandescent lamp makes around 700 lumens, and a 15-watt compact fluorescent lamp produces about 800 lumens, but actual output varies by specific design. Rating and marketing emphasis is shifting away from wattage and towards lumen output, to give the purchaser a directly applicable basis upon which to select a lamp.

qas: question: What is designing as it applies to built environments?
answers: text: architectural lighting design

question: Would you consider aesthetic elements alone in architectural lighting design?
answers: text: kno

question: What is the name of the software sometimes used to help calculate lighting needs in a built environment?
answers: text: Radiance

question: Hand-calculations are based off of what type of data?
answers: text: tabular

question: What type of factor calculation can be used to find out how much daylight is received in a internal space.
answers: text: Daylight factor calculation.
context: Lighting design as it applies to the built environment is known as 'architectural lighting design'. Lighting of structures considers aesthetic elements as well as practical considerations of quantity of light required, occupants of the structure, energy efficiency and cost. Artificial lighting takes into account the amount of daylight received in an internal space by using Daylight factor calculation. For simple installations, hand-calculations based on tabular data are used to provide an acceptable lighting design. More critical or optimized designs now routinely use mathematical modeling on a computer using software such as Radiance which can allow an Architect to quickly undertake complex calculations to review the benefit of a particular design.

qas: question: What type of paint tends to absorb light?
answers: text: dark paint

question: What kind of paint makes a room a room look larger and brighter?
answers: text: light paint
context: In some design instances, materials used on walls and furniture play a key role in the lighting effect< for example dark paint tends to absorb light, making the room appear smaller and more dim than it is, whereas light paint does the opposite. In addition to paint, reflective surfaces also have an effect on lighting design.

qas: question: What type of study is used to simulate lighting designs?
answers: text: Photometric studies
context: Photometric studies (also sometimes referred to as "layouts" or "point by points") are often used to simulate lighting designs for projects before they are built or renovated. This enables architects, lighting designers, and engineers to determine whether a proposed lighting setup will deliver the amount of light intended. They will also be able to determine the contrast ratio between light and dark areas. In many cases these studies are referenced against IESNA or CIBSE recommended lighting practices for the type of application. Depending on the type of area, different design aspects may be emphasized for safety or practicality (i.e. such as maintaining uniform light levels, avoiding glare or highlighting certain areas). Specialized software is often used to create these, which typically combine the use of two-dimensional digital CAD drawings and lighting calculation software (i.e. AGi32or Dialux).

qas: question: What is prepared prior to the performance for the lighting operator?
answers: text: lighting cues
context: Lighting illuminates the performers and artists in a live theatre, dance, or musical performance, and is selected and arranged to create dramatic effects. Stage lighting uses general illumination technology in devices configured for easy adjustment of their output characteristics.[citation needed] The setup of stage lighting is tailored for each scene of each production. Dimmers, colored filters, reflectors, lenses, motorized or manually aimed lamps, and different kinds of flood and spot lights are among the tools used by a stage lighting designer to produce the desired effects. A set of lighting cues are prepared so that the lighting operator can control the lights in step with the performance; complex theatre lighting systems use computer control of lighting instruments.

qas: question: Motion pictures employee the similar lighting techniques as which other form of lighting?
answers: text: stage lighting
context: Motion picture and television production use many of the same tools and methods of stage lighting. Especially in the early days of these industries, very high light levels were required and heat produced by lighting equipment presented substantial challenges. Modern cameras require less light, and modern light sources emit less heat.

qas: question: What is the basic SI unit of measurement?
answers: text: candela (cd)

question: What is the SI unit for lumiance?
answers: text: cd/m2

question: What is the CGS unit of lumiance?
answers: text: stilb

question: What is the amount of useful light emitted from a luminous flux measured in? 
answers: text: lumen (lm)
context: Measurement of light or photometry is generally concerned with the amount of useful light falling on a surface and the amount of light emerging from a lamp or other source, along with the colors that can be rendered by this light. The human eye responds differently to light from different parts of the visible spectrum, therefore photometric measurements must take the luminosity function into account when measuring the amount of useful light. The basic SI unit of measurement is the candela (cd), which describes the luminous intensity, all other photometric units are derived from the candela. Luminance for instance is a measure of the density of luminous intensity in a given direction. It describes the amount of light that passes through or is emitted from a particular area, and falls within a given solid angle. The SI unit for luminance is candela per square metre (cd/m2). The CGS unit of luminance is the stilb, which is equal to one candela per square centimetre or 10 kcd/m2. The amount of useful light emitted from a source or the luminous flux is measured in lumen (lm).

qas: question: What is a standardized model of human visual brightness?
answers: text: luminosity function

question: What is the SI unit of illuminace and luminous emittance?
answers: text: Lux
context: The SI unit of illuminance and luminous emittance, being the luminous power per area, is measured in Lux. It is used in photometry as a measure of the intensity, as perceived by the human eye, of light that hits or passes through a surface. It is analogous to the radiometric unit watts per square metre, but with the power at each wavelength weighted according to the luminosity function, a standardized model of human visual brightness perception. In English, "lux" is used in both singular and plural.

qas: question: What does UGR stand for?
answers: text: Unified Glare Rating
context: Several measurement methods have been developed to control glare resulting from indoor lighting design. The Unified Glare Rating (UGR), the Visual Comfort Probability, and the Daylight Glare Index are some of the most well-known methods of measurement. In addition to these new methods, four main factors influence the degree of discomfort glare; the luminance of the glare source, the solid angle of the glare source, the background luminance, and the position of the glare source in the field of view must all be taken into account.

qas: question: What does CCT stand for?
answers: text: correlated color temperature

question: What does CRI stand for?
answers: text: color rendering index

question: What metric indicates a lights ability to make object appear natural?
answers: text: CRI

question: What metric indicates "warmth" or "coolness"?
answers: text: CCT
context: To define light source color properties, the lighting industry predominantly relies on two metrics, correlated color temperature (CCT), commonly used as an indication of the apparent "warmth" or "coolness" of the light emitted by a source, and color rendering index (CRI), an indication of the light source’s ability to make objects appear natural.

qas: question: What does GAI stand for?
answers: text: gamut area index

question: The relative separating of object colors illuminated by a light source is known as?
answers: text: GAI

question: Would a lower GAI mean higher apparent saturation or vividness of object colors?
answers: text: ano
context: For example, in order to meet the expectations for good color rendering in retail applications, research suggests using the well-established CRI along with another metric called gamut area index (GAI). GAI represents the relative separation of object colors illuminated by a light source; the greater the GAI, the greater the apparent saturation or vividness of the object colors. As a result, light sources which balance both CRI and GAI are generally preferred over ones that have only high CRI or only high GAI.

qas: question: What is typically used to measure light?
answers: text: light dosimeters
context: Typical measurements of light have used a Dosimeter. Dosimeters measure an individual's or an object's exposure to something in the environment, such as light dosimeters and ultraviolet dosimeters.

qas: question: What measures the amount of light entering the eye?
answers: text: Daysimeter

question: A Daysimeter what type of personal meter?
answers: text: circadian light meter
context: In order to specifically measure the amount of light entering the eye, personal circadian light meter called the Daysimeter has been developed. This is the first device created to accurately measure and characterize light (intensity, spectrum, timing, and duration) entering the eye that affects the human body's clock.

qas: question: How many days can the Daysimeter gather for analysis?
answers: text: 30

question: What type of light stimulates the circadian system?
answers: text: short-wavelength light
context: The small, head-mounted device measures an individual's daily rest and activity patterns, as well as exposure to short-wavelength light that stimulates the circadian system. The device measures activity and light together at regular time intervals and electronically stores and logs its operating temperature. The Daysimeter can gather data for up to 30 days for analysis.

qas: question: What is a basic concept of deciding how much illumination is required for a given task? 
answers: text: Specification of illumination requirements
context: Specification of illumination requirements is the basic concept of deciding how much illumination is required for a given task. Clearly, much less light is required to illuminate a hallway compared to that needed for a word processing work station. Generally speaking, the energy expended is proportional to the design illumination level. For example, a lighting level of 400 lux might be chosen for a work environment involving meeting rooms and conferences, whereas a level of 80 lux could be selected for building hallways. If the hallway standard simply emulates the conference room needs, then much more energy will be consumed than is needed. Unfortunately, most of the lighting standards even today have been specified by industrial groups who manufacture and sell lighting, so that a historical commercial bias exists in designing most building lighting, especially for office and industrial settings.

qas: question: What can help reduce energy and usage cost by providing light only when or where it is needed? 
answers: text: Lighting control
context: Lighting control systems reduce energy usage and cost by helping to provide light only when and where it is needed. Lighting control systems typically incorporate the use of time schedules, occupancy control, and photocell control (i.e.daylight harvesting). Some systems also support demand response and will automatically dim or turn off lights to take advantage of utility incentives. Lighting control systems are sometimes incorporated into larger building automation systems.

qas: question: What type of standard do newer control systems use? 
answers: text: wireless mesh open standards

question: What is the name of one type of control system used? 
answers: text: ZigBee

question: Does a wireless mesh open standard make installation harder?
answers: text: no
context: Many newer control systems are using wireless mesh open standards (such as ZigBee), which provides benefits including easier installation (no need to run control wires) and interoperability with other standards-based building control systems (e.g. security).

qas: question: What sensor controls light with motion sensors? 
answers: text: Occupancy sensors

question: What does a passive infrared sensor react to? 
answers: text: changes in heat

question: What type of sensor transmits sound above the range of human hearing?
answers: text: Ultrasonic sensors

question: Would you want to use passive infrared sensor in a area requiring 360-degree coverage?
answers: text: no
context: Occupancy sensors to allow operation for whenever someone is within the area being scanned can control lighting. When motion can no longer be detected, the lights shut off. Passive infrared sensors react to changes in heat, such as the pattern created by a moving person. The control must have an unobstructed view of the building area being scanned. Doors, partitions, stairways, etc. will block motion detection and reduce its effectiveness. The best applications for passive infrared occupancy sensors are open spaces with a clear view of the area being scanned. Ultrasonic sensors transmit sound above the range of human hearing and monitor the time it takes for the sound waves to return. A break in the pattern caused by any motion in the area triggers the control. Ultrasonic sensors can see around obstructions and are best for areas with cabinets and shelving, restrooms, and open areas requiring 360-degree coverage. Some occupancy sensors utilize both passive infrared and ultrasonic technology, but are usually more expensive. They can be used to control one lamp, one fixture or many fixtures.

qas: question: What is the oldest method of interior lighting? 
answers: text: Daylighting

question: Daylighting has been proven to have negative effects on people?
answers: text: not
context: Daylighting is the oldest method of interior lighting. Daylighting is simply designing a space to use as much natural light as possible. This decreases energy consumption and costs, and requires less heating and cooling from the building. Daylighting has also been proven to have positive effects on patients in hospitals as well as work and school performance. Due to a lack of information that indicate the likely energy savings, daylighting schemes are not yet popular among most buildings.

qas: question: What is a form of solid state lighting?
answers: text: LEDs

question: What is the best way to control light emissions of LEDs?
answers: text: nonimaging optics
context: In recent years light emitting diodes (LEDs) are becoming increasingly efficient leading to an extraordinary increase in the use of solid state lighting. In many situations, controlling the light emission of LEDs may be done most effectively by using the principles of nonimaging optics.

qas: question: What can cause health effects such headache frequency?
answers: text: higher lighting levels
context: Beyond the energy factors being considered, it is important not to over-design illumination, lest adverse health effects such as headache frequency, stress, and increased blood pressure be induced by the higher lighting levels. In addition, glare or excess light can decrease worker efficiency.

qas: question: Maximizing the right amount of light at the appropriate time for elderly may help systems of what? 
answers: text: Alzheimer's Disease

question: The human circadian system is entrained to how many hours light-dark pattern?
answers: text: 24

question: What happens to the natural carcidan cycle when light-dark patterns are disrupted?
answers: text: disrupt the natural circadian cycle
context: Analysis of lighting quality particularly emphasizes use of natural lighting, but also considers spectral content if artificial light is to be used. Not only will greater reliance on natural light reduce energy consumption, but will favorably impact human health and performance. New studies have shown that the performance of students is influenced by the time and duration of daylight in their regular schedules. Designing school facilities to incorporate the right types of light at the right time of day for the right duration may improve student performance and well-being. Similarly, designing lighting systems that maximize the right amount of light at the appropriate time of day for the elderly may help relieve symptoms of Alzheimer's Disease. The human circadian system is entrained to a 24-hour light-dark pattern that mimics the earth’s natural light/dark pattern. When those patterns are disrupted, they disrupt the natural circadian cycle. Circadian disruption may lead to numerous health problems including breast cancer, seasonal affective disorder, delayed sleep phase syndrome, and other ailments.

qas: question: Who documented 23 surgical patients assigned rooms looking out on a natural scene?
answers: text: Robert Ulrich

question: Did the patients with natural scenes have longer postoperative hospital stays?
answers: text: no

question: Did patients that have natural scenes require more potent analgesics?
answers: text: no
context: A study conducted in 1972 and 1981, documented by Robert Ulrich, surveyed 23 surgical patients assigned to rooms looking out on a natural scene. The study concluded that patients assigned to rooms with windows allowing lots of natural light had shorter postoperative hospital stays, received fewer negative evaluative comments in nurses’ notes, and took fewer potent analegesics than 23 matched patients in similar rooms with windows facing a brick wall. This study suggests that due to the nature of the scenery and daylight exposure was indeed healthier for patients as opposed to those exposed to little light from the brick wall. In addition to increased work performance, proper usage of windows and daylighting crosses the boundaries between pure aesthetics and overall health.

qas: question: What University was Alision Jing Xu the assistant professor of management at?
answers: text: University of Toronto Scarborough

question: What Univerity was Aparna Labroo associated with?
answers: text: Northwestern University
context: Alison Jing Xu, assistant professor of management at the University of Toronto Scarborough and Aparna Labroo of Northwestern University conducted a series of studies analyzing the correlation between lighting and human emotion. The researchers asked participants to rate a number of things such as: the spiciness of chicken-wing sauce, the aggressiveness of a fictional character, how attractive someone was, their feelings about specific words, and the taste of two juices–all under different lighting conditions. In their study, they found that both positive and negative human emotions are felt more intensely in bright light. Professor Xu stated, "we found that on sunny days depression-prone people actually become more depressed." They also found that dim light makes people make more rational decisions and settle negotiations easier. In the dark, emotions are slightly suppressed. However, emotions are intensified in the bright light.

qas: question: What devised a method where kerosene could be distilled from petroleum?
answers: text: Dr. Abraham Gesner

question: What year was it discovered that petroleum could be distilled into kerosene? 
answers: text: 1849

question: What method of lighting have been used since 1820s?
answers: text: coal-gas methods
context: In 1849, Dr. Abraham Gesner, a Canadian geologist, devised a method where kerosene could be distilled from petroleum. Earlier coal-gas methods had been used for lighting since the 1820s, but they were expensive. Gesner's kerosene was cheap, easy to produce, could be burned in existing lamps, and did not produce an offensive odor as did most whale oil. It could be stored indefinitely, unlike whale oil, which would eventually spoil. The American petroleum boom began in the 1850s. By the end of the decade there were 30 kerosene plants operating in the United States. The cheaper, more efficient fuel began to drive whale oil out of the market. John D. Rockefeller was most responsible for the commercial success of kerosene. He set up a network of kerosene distilleries which would later become Standard Oil, thus completely abolishing the need for whale-oil lamps. These types of lamps may catch fire or emit carbon-monoxide and sometimes are odorous making them problematic for asthmatic people.

qas: question: What does CFL stand for?
answers: text: Compact fluorescent lamps

question: Are all CFLs suitable for dimming?
answers: text: not
context: Compact fluorescent lamps (aka 'CFLs') use less power to supply the same amount of light as an incandescent lamp, however they contain mercury which is a dispose hazard. Due to the ability to reduce electric consumption, many organizations have undertaken measures to encourage the adoption of CFLs. Some electric utilities and local governments have subsidized CFLs or provided them free to customers as a means of reducing electric demand. For a given light output, CFLs use between one fifth and one quarter of the power of an equivalent incandescent lamp. One of the simplest and quickest ways for a household or business to become more energy efficient is to adopt CFLs as the main lamp source, as suggested by the Alliance for Climate Protection. Unlike incandescent lamps CFL's need a little time to 'warm up' and reach full brightness. Care should be taken when selecting CFL's because not all of them are suitable for dimming.

qas: question: How much more power does a standard incandescent bulb use compared to LED?
answers: text: 10%

question: What is the average lifetime of a CFL?
answers: text: 50,000 hours

question: How much power does a halogen lamp save compared to a standard blub?
answers: text: 70%
context: LED lamps have been advocated as the newest and best environmental lighting method. According to the Energy Saving Trust, LED lamps use only 10% power compared to a standard incandescent bulb, where compact fluorescent lamps use 20% and energy saving halogen lamps 70%. The lifetime is also much longer — up to 50,000 hours. A downside is still the initial cost, which is higher than that of compact fluorescent lamps.

qas: question: What is known as artificial light that is excessive or intrusive?
answers: text: Light pollution

question: What causes sharp shadows around buildings? 
answers: text: glare
context: Light pollution is a growing problem in reaction to excess light being given off by numerous signs, houses, and buildings. Polluting light is often wasted light involving unnecessary energy costs and carbon dioxide emissions. Light pollution is described as artificial light that is excessive or intrudes where it is not wanted. Well-designed lighting sends light only where it is needed without scattering it elsewhere. Poorly designed lighting can also compromise safety. For example, glare creates safety issues around buildings by causing very sharp shadows, temporarily blinding passersby making them vulnerable to would-be assailants.

qas: question: In a battlefield does not have natural light what could you use instead? 
answers: text: searchlights and flares

question: The use of what may disclose your own hidden position on a battlefield? 
answers: text: light

question: Modern warfare has seen the increased use of what? 
answers: text: infrared cameras
context: From a military standpoint, lighting is a critical part of the battlefield conditions. Shadows are good places to hide, while bright areas are more exposed. It is often beneficial to fight with the Sun or other light source behind you, giving your enemy disturbing visual glare and partially hiding your own movements in backlight. If natural light is not present searchlights and flares can be used. However the use of light may disclose your own hidden position and modern warfare have seen increased use of night vision through the use of infrared cameras and image intensifiers.

qas: question: What can be used by military for targeting?
answers: text: Flares

question: What has eliminated the need for flares on a battlefield?
answers: text: laser-guided and GPS weapons
context: Flares can also be used by the military to mark positions, usually for targeting, but laser-guided and GPS weapons have eliminated this need for the most part.

qas: question: What does the CIE stand for?
answers: text: International Commission on Illumination
context: The International Commission on Illumination (CIE) is an international authority and standard defining organization on color and lighting. Publishing widely used standard metrics such as various CIE color spaces and the color rendering index.

qas: question: What does the IESNA stand for? 
answers: text: The Illuminating Engineering Society of North America

question: Who else publishes along with IESNA? 
answers: text: ANSI and ASHRAE

question: What defines photo metric data?
answers: text: distribution of light released
context: The Illuminating Engineering Society of North America (IESNA), in conjunction with organizations like ANSI and ASHRAE, publishes guidelines, standards, and handbooks that allow categorization of the illumination needs of different built environments. Manufacturers of lighting equipment publish photometric data for their products, which defines the distribution of light released by a specific luminaire. This data is typically expressed in standardized form defined by the IESNA.

qas: question: What does IALD stand for?
answers: text: The International Association of Lighting Designers
context: The International Association of Lighting Designers (IALD) is an organization which focuses on the advancement of lighting design education and the recognition of independent professional lighting designers. Those fully independent designers who meet the requirements for professional membership in the association typically append the abbreviation IALD to their name.

qas: question: What does PLDA stand for?
answers: text: The Professional Lighting Designers Association

question: What was the PLDA formerly known as?
answers: text: ELDA
context: The Professional Lighting Designers Association (PLDA), formerly known as ELDA is an organisation focusing on the promotion of the profession of Architectural Lighting Design. They publish a monthly newsletter and organise different events throughout the world.

qas: question: Who offers the Lighting Certification Examination? 
answers: text: NCQLP

question: What does NCQLP stand for?
answers: text: The National Council on Qualifications for the Lighting Professions

question: Which abbreviation can you append to your name after becoming Lighting Certified?
answers: text: LC

question: What other national examinations are available?
answers: text: CLEP and CLMC
context: The National Council on Qualifications for the Lighting Professions (NCQLP) offers the Lighting Certification Examination which tests rudimentary lighting design principles. Individuals who pass this exam become ‘Lighting Certified’ and may append the abbreviation LC to their name. This certification process is one of three national (U.S.) examinations (the others are CLEP and CLMC) in the lighting industry and is open not only to designers, but to lighting equipment manufacturers, electric utility employees, etc.

qas: question: What does PLASA stand for? 
answers: text: The Professional Lighting And Sound Association

question: Where is PLASA based?
answers: text: UK

question: How many individuals does PLASA represent?
answers: text: 500+

question: What does RoHS stand for?
answers: text: Restriction of Hazardous Substances Directive
context: The Professional Lighting And Sound Association (PLASA) is a UK-based trade organisation representing the 500+ individual and corporate members drawn from the technical services sector. Its members include manufacturers and distributors of stage and entertainment lighting, sound, rigging and similar products and services, and affiliated professionals in the area. They lobby for and represent the interests of the industry at various levels, interacting with government and regulating bodies and presenting the case for the entertainment industry. Example subjects of this representation include the ongoing review of radio frequencies (which may or may not affect the radio bands in which wireless microphones and other devices use) and engaging with the issues surrounding the introduction of the RoHS (Restriction of Hazardous Substances Directive) regulations.