Light - Key terms APERTURE: An opening. DIFFRACTION: The bending of waves around obstacles, or the spreading of waves by passing them through an aperture. DIFFUSION: A process by which the concentration or density of something isdecreased. ELECTROMAGNETIC SPECTRUM:
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What are some basic terms for understanding lighting technology?
To help you stay informed and educated, here are some basic terms for understanding lighting technology. It is a common misconception that higher wattage equals higher light output—in part due to the fact that incandescent light output generally increases with wattage numbers. With LED technology, this is not the case.
What are the 4 definitions of light?
The top 4 are: dark, bright, fluorescent and glow. You can get the definition (s) of a word in the list below by tapping the question-mark icon next to it. The words at the top of the list are the ones most associated with light, and as you go down the relatedness becomes more slight.
What is the meaning of long distance light?
A term used to describe a light source that has an effective intensity at a relatively long distance. This term is very subjective and dependent on the type of light source used. An opening provided with one or more slanted fixed or movable fins to control the angle of light, like venetian blinds for lighting.
What is a synonym for light?
Some common synonyms of light are easy, effortless, facile, simple, and smooth. While all these words mean "not demanding effort or involving difficulty," light stresses freedom from what is burdensome. a light teaching load.
What are the light terms?
The luminous flux describes the quantity of light emitted by a light source per second. The luminous efficacy is the ratio of the luminous flux to the electrical power consumed (lm/W). It is a measure of economic efficacy of a light source.
What are the 4 types of light?
What are the 4 types of lighting?Ambient lighting.Task lighting.Accent lighting.Decorative lighting.
What are the 5 types of light?
5 Different Types of Light Bulbs1- Incandescent Bulbs:2- Fluorescent Lamps:3- Compact Fluorescent Lamps (CFL):4- Halogen Lamps:5- Light Emitting Diode (LED):
What are the 3 types of lights?
There are three basic types of lighting you should layer in a room in order to accomplish this: Ambient or general lighting. Accent lighting. Task lighting.
What are two basic types of light?
There are two basic types of light sources: Incandescence and Luminescence.
What are the kinds of light?
Different Types of Lights or Lamps in a Lighting systemIncandescent lamps.Compact fluorescent lamps.Halogen lamps.Metal halide Lamps.Light Emitting Diode.Fluorescent tube.Neon lamps.High intensity discharge lamps.More items...•
What are the seven types of light?
The electromagnetic spectrum is generally divided into seven regions, in order of decreasing wavelength and increasing energy and frequency. The common designations are radio waves, microwaves, infrared (IR), visible light, ultraviolet (UV) light, X-rays and gamma-rays.
What are the six common sources of light?
Answer: Common light sources include incandescent, fluorescent, laser, neon, tungsten-halogen, and sodium-vapor bulbs.
What are the 6 different types of light?
There are six principal types of lighting:Natural Daylight.Incandescent Lighting.Fluorescent Lighting.Tungsten-Halogen Lighting.LED Lighting.High-Intensity Discharge (HID) Lighting.
What are the properties of light?
The primary properties of light are intensity, propagation direction, frequency or wavelength spectrum and polarization. Its speed in a vacuum, 299 792 458 metres a second (m/s), is one of the fundamental constants of nature.
What are sources of light?
A light source is anything that makes light. There are natural and artificial light sources. A few examples of natural light sources include the Sun, stars and candles. A few examples of artificial light sources include light bulbs, lamp posts and televisions.
What are light components?
The three components of lightAmbient lighting. Ambient lighting is evenly distributed and illuminates entire rooms. ... Zone lighting. Zone lighting provides a large amount of light where it is needed for specific activities, e.g. reading, eating, working or looking at pictures or paintings. ... Mood lighting.
What is light in the Bible?
In the Bible, light has always been a symbol of holiness, goodness, knowledge, wisdom, grace, hope, and God's revelation. By contrast, darkness has been associated with evil, sin, and despair.
What are the 5 characteristics of light?
Photography is “writing with light.” So, let's build our conversation about lighting on five fundamental characteristics of light: Direction, Intensity, Color, Contrast, and Hardness.
What are the 7 properties of light?
There are 7 basic properties of light :Reflection of light.Refraction of light.Diffraction of light.Interference of light.Polarization of light.Dispersion of light.Scattering of light.
What are the four types of lights in unity?
Types of lightEffect of a Point Light in the scene.Effect of a Spot Light in the scene.Effect of a Directional Light in the scene.Light is emitted across the surface of an Area Light producing a diffuse light with soft shadowing.
What is the wavelength of a wave?
The wavelength of a wave is denoted λ and is the distance in space from one peak to any adjacent peak, one trough to any adjacent trough, or indeed from any one point to a similar point on an adjacent cycle. In other words, it is the number of units of length per complete wave cycle.
What is the path taken by light rays?
The path taken by a light ray will be the one that minimizes the time taken in passing between any two points. This is equivalent to saying that the duration of the path taken by light is stationary with respect to small variations in the path.
When two waves occupy the same point or region in space, the resulting disturbance of the medium is the sum of?
When any two waves occupy the same point or region in space, the resulting disturbance of the medium is the sum of the disturbances of the individual waves (in other words, just add the amplitudes, paying attention to the sign). This is the same as saying that the wave equation is linear: if μ1 and μ2 are solutions, then aμ1 + bμ2 are also solutions, for some constants a and b. One consequence of this is that two or more waves can pass through each other with each being unaffected by the other.
What is a harmonic wave?
Harmonic. Waves that take on the shape determined by the harmonic functions, sine and cosine. They are also called sinusoidal waves or simple harmonic waves. Not only are these functions simple to deal with, but Fourier analysis tells us that any wave can by synthesized by the superposition of harmonic waves.
What is the angle of light?
Angle of Light. Angle between the orientation of a light source and the viewing direction. For example, the angle of light is 0° when looking at a downlight directly from below, and increases progressively as the viewer steps away from it. The term is commonly used in theatrical lighting, to describe the angle between the stage lighting direction ...
What is the base of a lamp?
Base. The part of a lamp that connects to the lighting fixture, providing both physical support and electric power for the lamp. A lamp and fixture can only be used together if the lamp base matches the fixture socket. The bases of most residential lamps use either a screw or multiple pins.
What is ballast in lighting?
Ballast. A component required by fluorescent and HID lighting fixtures. It controls the voltage and electric current provided to the lamp during ignition and operation, preventing overheating or premature failure. Depending on their internal construction, ballasts can be either magnetic or electronic.
What is the beam angle of a light fixture?
Also known as beam spread, the beam angle is a value that describes the downward light cone emitted by a lighting fixture with a reflector. The beam angle is measured between the downward direction, where the lamp provides maximum lighting intensity, and the direction in which intensity drops to 50%. In other words, a lamp with a large beam angle spread its lighting into a wider cone.
What is the purpose of argon in lamps?
A chemical element, and one of the noble gases. It is used inside the bulbs of incandescent lamps to prevent oxidation of their filaments. Argon can also be used in gas-discharge lamps to emit violet light, or blue if mixed with mercury.
What is the output of outdoor fixtures that is emitted opposite to the intended direction?
The lighting output of outdoor fixtures that is emitted opposite to the intended direction, generally an undesirable effect. For example, if the pole lamps in a parking lot emit backlight towards adjacent homes or apartments, it can be bothersome for the property owners.
What is backlighting in art?
Backlighting is a type of accent lighting, and is commonly used to draw attention to works of art .
What is the standard unit of measure for light intensity?
The current standard unit of measure to be used is “candela.”.
What is the difference between watts and lumens?
Watts are a measure of power consumption, while lumens are a measurement of visible light output. When you want to know how bright a light will be, you need to identify the lumen output, not the wattage —especially when comparing LED and bulb-based lights.
How are candelas and lumens similar?
Candela are similar to lumens in that both deal with light output as perceived by the human eye . The key difference between the two is that candela is specifically a measurement of directional intensity. One candela is close to the light intensity produced by an ordinary candle as perceived by the human eye , and addresses how bright a light source is in a particular direction.
Why are raw lumens not representative of actual light output?
Raw Lumens are NOT representative of the actual light output because it does not take into account the electrical and optical losses that impact all lights.
What is the difference between a foot-candle and a lux?
Foot-candles and lux measure the same thing—the amount of visible light that falls on a surface. The difference is that the foot-candle uses the Imperial standard measuring system (feet, pounds, etc.), while the lux uses the metric system (meters, grams, etc.). A single foot-candle is equivalent to the amount of light that falls on a surface ...
Does LED light output increase with wattage?
It is a common misconception that higher wattage equals higher light output—in part due to the fact that incandescent light output generally increases with wattage numbers. With LED technology, this is not the case. LEDs can emit the same, if not more light than a bulb, while consuming less power.
What is the meaning of "light"?
1 having little weight. the suitcase was as light as a feather after all the clothes were removed. Synonyms for light. featherlight, feathery, lightweight, underweight, weightless. Words Related to light.
How does the adjective light contrast with its synonyms?
Some common synonyms of light are easy, effortless, facile, simple, and smooth. While all these words mean "not demanding effort or involving difficulty," light stresses freedom from what is burdensome.
When is easy a more appropriate choice than light?
However, easy is applicable either to persons or things imposing tasks or to activity required by such tasks.
How do facile and easy relate to one another, in the sense of light?
Facile often adds to easy the connotation of undue haste or shallowness.
Where would smooth be a reasonable alternative to light?
Although the words smooth and light have much in common, smooth stresses the absence or removal of all difficulties, hardships, or obstacles.
What are the spark plug lights called?
Some referred to them as coffee pot lights or bug lights. After the invention of the internal combustion engine they became known as spark plug lights. Cast-iron Tower: Usually cylindrical in shape, these lights became popular in the 1840’s. Cast iron was stronger than stone and comparatively light.
What is composite group flashing light?
Composite Group Flashing Light: A group-flashing light in which the flashes combined in successive groups of different numbers of flashes.
What is the arc of visibility?
Arc of Visibility: The portion of the horizon over which a lighted aid to navigation is visible from seaward. Argand Lamp: A hollow single-wick oil lamp. The Argand lamp was named after Ami Argand, the Swiss inventor who developed the design.
What is the name of the fuel used in lighthouses?
Lighthouse Glossary of Terms. Aerobeacon: A searchlight-type light originally designed for use at airports and adapted for use in a number of lighthouses. Acetylene: A fuel used which began to be used in lighthouses after 1910. It was the first fuel to eliminate the need for a keeper to carry oil up the tower, since it could be stored on ...
What is a cottage style lighthouse?
Cottage Style Lighthouse: A lighthouse comprised of a small one story buildig with a light on top that housed the keeper (s).
What is the purpose of a buoy, beacon, lighthouse, lightship, or any other structure or device installed?
Aid to Navigation: A buoy, beacon, lighthouse, lightship or any other structure or device installed, built or maintained for the purpose of assist ing the navigation of vessels.
What is a caisson lighthouse?
Caisson Style Tower: Lighthouse built on an iron caisson. A caisson was essentially a hollow tube made of heavy rolled-iron plates. The caissons were bolted together on land, transported into place, sunk and filled with sand, gravel, rock or cement. Some referred to them as coffee pot lights or bug lights. After the invention of the internal combustion engine they became known as spark plug lights.
